- guns (combines small guns and big guns)
- explosives
- hand to hand (combines melee weapons and unarmed)
- energy weapons
- traps
- science (now only improves the effects of chems and allows you to create your own, like alchemy in TES: oblivion)
- security (combines lockpicking and the hacking aspect of science)
- medicine
- repair
- sneak
- speech
- barter
- leadership (a new skill that makes companions more powerfull, allows you to boss some characters into doing your bidding)
- survival
- driving (another new skill, this one improves your abillity to drive vehicles)
all skills should go up to 200 base value, and all the way up to 250 thank to equipment bonuses, the maximum base value of 200 is neccessary in order to prevent you from being able to max most (if not all) skills and the "limit breaking" equipment bonuses (in combination with other bonuses, like carry weight, AP, CH chance, etc...) are vital to encourage the use of regular clothing and light armor amongst "non-sneak" characters.
also, it would be nice to see weapons who depend on two or more skills to be effective, such as rocket launchers (guns and explosives), mines (traps and explosives), stun batons (hand to hand + energy weapons), etc...
vehicles would be a great addition to the fallout series, the system does not neccesarily need to be complex, only 5 vehicle categories would be sufficient (motorbike, buggy, car, truck, apc), the player could "save" his vehicle onto the pip boy, allowing you to see it's position on the map.
also with NPCs using vehicles the game experience would be highly enriched (think being chased down by raiders in armored buggies as you desperately try to take out their wheels, engine or driver to slow them down).
like in NV, perks should only be gained once every 2 levels.
the perks should not only be more diverse but also more usefull in general (perks like cannibal and lead belly are not as usefull as they could be).
also, more level two, four and six perks, in order to make a truely customised character from the start, some examples:
- intense training (level 2). 4 ranks.
- talented (level 2): increases the maximum value of one of your tagged skills by 10 (210/ 260), 1 rank.
- survivor (level 2): increases resistance to poison and radiation by 15%, 1 rank. requires 6 endurance and 30 survival.
- bone crusher (level 2): increases limb damage done by your hand to hand attacks by 20%. 1 rank. requires 6 strength.
- eloquent (level 2): increases the effectiveness of charisma by 5%. 1 rank. requires 6 charisma.
- chem dealer (level 2): increases the price of all chems you sell by 10%. 1 rank. requires 4 intelligence.
- alchohol fueled (level 2): whenever you drink any kind of alchohol, you do 10% more damage for the whole duration of it's effects. 1 rank.
- run! (level 2): allows you to sprint 10% longer. 1 rank. requires 4 endurance and 4 agility.
- resourcefull repairs (level 2): allows you to restore a small ammount of condition (+-2 %) to any piece of equipment with duct tape or scrap metal. 1 rank, requires 6 intelligence and 30 repair.
- sneaky bam (level 2): increases stealth by 8 when sneaking. 1 rank. requires 6 agility and 30 sneak.
- perforation (level 4): whenever you are equipped with any kind of knife you ignore 8 points of the target's DT. 1 rank. requires 6 strength and 45 hand to hand.
- center mass (level 4): increases damage and fatigue damage by 20% when shooting an enemy in the torso with all guns. 1 rank, requires 4 perception and 20 guns.
- chemistry (level 4): increases the effectiveness of all chems you create by 10%. 3 ranks. requires 6 intelligence and 40 science.
- safety in numbers (level 4): increases your DR by 4 for every follower you have. 1 rank. requires 30 leadership.
- tactical explosive (level 4): increases the radius of your explosions by 20%. 1 rank. requires 45 explosives.
- good ol' violence (level 4): increases all damage you do by 5%. 2 ranks.
- well liked (level 4): if your reputation with a faction is good, you will get a 15 point bonus to your speech when talking to one of it's members. 1 rank. requires 6 charisma.
- duck and cover (level 6): when crouched you take 20% less damage from explosions. 1 rank. requires 4 intelligence.
that's all i have for now, more to come later. of course these are only basic conceps so some may be overpowered and others underpowered.