Well thats fit Skyrim well there is many mountains for cliffhangers and such feature can be used to increase variability in Rogue game experience by adding stealth entrances at windows to certain houses and cities.
Climbing can use fatigue reserves and zero fatigue actor will fall, climbing can be usable at certain surfaces only so devs can decide where can be climbable surface and where is not, enemy actors can also use climbing to establish ambushes for sniping or pursuit player who manage sit on top of rock and shoot into melee combatants without consequences.
No need make all surfaces and objects climbable just give us mechanic for example similar to good climbing in Shadow of Colossus and Gothic and Thief and by using such mechanic modder will expand it even to Assassin Creed free run or even spider man style climbing in balanced fully optional way of mods, just give initial base mechanic for climbing since it useful for gameplay in overall, so there will http://www.youtube.com/watch?v=WQfMLt7TmLE
Mechanic will involve using of grab key, jump key and free hands no need create special keys for it as well no need Climbing skill since an Body Fitness skill can decide work of such feature and fatigue will be limit for climbing as well not all surfaces can be climbable for example climbing of normal obstacle will easy by grabbing edge of it, climbing on wall will require specially placed activator zone and maybe special equipment like climbing gloves and boots so devs can decide where player can climb where is not, so it balanced way.
Shadow of the Colossus climbing
http://www.youtube.com/watch?v=ExI4nnQNLes
http://www.youtube.com/watch?v=vnqirerfaXA
Severance: Blade of Darkness climbing
http://www.youtube.com/watch?v=WZdP83kxT-U
Gothic 2 climbing
http://www.youtube.com/watch?v=TC9I48ReLfk
Thief Deadly Shadows climbing
http://www.youtube.com/watch?v=m8gxQkcs4JI
http://www.youtube.com/watch?v=swl5Sm_uHXo
In such cases even ladder can be done, show us thats Ancient curse of Ladder cleansed from TES by power of new engine, common guys having no Z axis movement in 2011 looks really strange does not?
Just think how interesting dungeons and exploring can be done with utilizing Z axis in game.
or Rope Arrow
http://www.youtube.com/watch?v=CIyx23OY8Nk
http://www.youtube.com/watch?v=khPWcMmMmxQ
http://www.youtube.com/watch?v=iegdk4JDhi4
Actually such tool can be done but in chose between climbing and climbing + grappling hook and no climbing at all if devs will decide such feature "too hard" for implementation and spending time on it, better if there will be simple climbing as base at last, all other features can be done with mods.
Like this?
http://www.youtube.com/watch?v=5EankCEgz3w
There can be also
Tripwires
http://www.youtube.com/watch?v=mUTSskDynAI
http://www.youtube.com/watch?v=mWEZFxK8WEo
http://www.youtube.com/watch?v=rjN8A9M8yJ0&NR
Grease arrows
http://www.youtube.com/watch?v=FNenGNn-F14
Bombs
http://www.youtube.com/watch?v=IYP6NZSlIC8
Adding hand placing traps will make security skill more useful then it was in vanilla Oblivion, as well add more fun into game, modder add such features but mod mods not accessible at consoles, does console player does not deserve more fun then before? Devs by self say thats they have large auditory of console players so why not make more interesting gameplay for them?
black eggs
flash bombs (viles that when busted cause a blinding light)
smoke blombs (same as flash bombs but create smoke that obscure vision)
Actually all of this bombs can be handled by Alchemy and simple throwing of flasks both throwing and more advanced alchemy are desirable features for rogues,
Return of throwing weapons will be great and many of us will agree with, under spoiler there is some Pro for returning throwing into game and if there is some Cons I'd like to hear them.
Spoiler Throwing weapons are not crossbows so will not looks outside of technology level in Skyrim (there is still can be an dwemeric artifact crossbow used as prototype for http://www.tesnexus.com/downloads/images/22684-2-1237587327.jpg),
Throwing weapons isn't hard to be done its utilize almost the same physique thats arrow have and was done with mods for Oblivion
http://www.youtube.com/watch?v=QzOsBAPoWQE in 2006 after few months after release of Oblivion completely on scripting and without OBSE
http://www.youtube.com/watch?v=2Yt_FdTIBeU&t=2m10s more advanced implementation uses OBSE and allow throwing of different items and certain weapons suit better for throwing like daggers and axes, throwing work as fully supported alternative to archery use attributes and marksman and train marksman skill on using, there is work collision detection so weapons bounce from stones and stick in wood.
So thee even no need create special throwing weapons normal arms can be used just need throwing system, once created it even can be usable for more combat oriented Telekinesis spell also so additionally there will be variability in damage dealing magic as positive side effect.
Throwing weapons will expand Marksman and make it more interesting and variable, why marksmans need relay only on bows when warriors have more then just swords and mages have more then one fire ball spell?
Work well with stealth alchemy as throwing flasks of Flammable Oils, Damage Equipment Acid, Slippery Grease, Poison and Paralyze Gas, Smoke or Flashbang Bombs etc.
Alchemy will be much more fortified as Stealth skill with more then just poisons, besides flaming oil confirmed already.
Add ability distract enemies guards with with throwing clutter around
http://www.youtube.com/watch?v=m0K4xkCRLYI
http://www.youtube.com/watch?v=D1CySGsoQy8
http://www.youtube.com/watch?v=5hRfcbWtlfg
Was also done before with mods, why not implement such feature in game and show thats AI become really good at this time, besides AI reacting on dropped items already confirmed so why not enhance it more?
Some throwing weapons can relay on Agility and Marksman so poison needles and darts, stars and daggers, can be usable by nimble characters, some on Strength and Marksman so powerful characters will not relay only on melee combat but also will have some options for short and middle distance like Throwing Axes, Javelins, Throwing Hammers, Stones for Giants
Traits and skills in two-handed and one-handed (dual wield) skills can be used if attributes was removed as well different weapons can burn different amount of Fatigue.
Throwing weapon isn't has the same purpose as bows have bows work middle-long distance need better targeting and usable for sniper and need time to be drawn, bows utilize both hands for work like two handed weapons
while Throwing weapon work on short-middle distance not need better targeting so there is no bow sway effect, usable for silent kills at short distance, take smaller time to draw, utilize dual wielding (we can throw two projective at one time) and even with some skills (perks) can give ability throw more weapons at one time thats anologue of dual wielding for marksman weapons.
No need different or special button for Throwing Grab Key can be used with Strike Button for current hand Simulationsly, hold it for some time and release will allow throw current equipped item forward, holding it more will allow thrown it furtherer, use just strike button will swing weapons as melee weapon, if throwing an clutter no need to show it in equipped in hand and quick tap of grab will drop item, while another quick tap will allow garb item again, no need hold button for dragging item around.
Unfortunately climbing has been confirmed out.
Can you provide source?
Thats was interesting feature and still can be easy improvable and balanced why exactly they decide not add even simple climbing into game?