Well yes such feature is interesting http://www.tesnexus.com/downloads/file.php?id=36313 comes in mind
This mod causes the player's skills to decay. Skill decay reduces your skill experience, as seen on your character sheet. If the bar drops to zero, you'll lose a rank in that skill. A skill which just gained a rank is protected from immediate decay.
There are two decay modes: over time, and from advancement. Decay from advancement means that when one skill gains a rank, all others are reduced slightly. Decay over time causes all skills to go down at steady rate. Both modes are enabled by default, but they can be disabled individually.
Skills at low ranks suffer much less decay. Class skills decay slower than non-class skills, and no skill will ever decay below its starting value.
it was good way to handicap player since we cant just master an skill and start maxing out others to become ultimate Jack of All Trades, what you use thats stay trained what used in least clean from mind after some time.
Another good thing it make classes more visible since class skills degrade in much slower rate, but as well it help in non class system also to keep interest of player in most useful skills for his character and don't spread on all skills.
But what we known about Skyrim leveling?
There will be perks thats make actual difference between skills and specializations they are limited in number to 50 per character.
Skills progress with variable rates at lower levels they progress faster then on higher ones, if not take Guardian Stone Power (thats represent chose of major and minor skills for specialization path from previous games) all skills will progress at the same rates during game.
Since skill rates are variable and dont constant like in Oblivion on different levels Skyrim leveling of skills already balanced.
Such feature nice to see in hardcoe mode or added with mods (I hope other great modders will take attention to Skyrim and port their awesome mods).
Actually, no it doesn't work that way...
You never completely forget anything, something will always remain. You will forget most of it, the details, sure, but if you try to re-learn it it will be a lot easier than starting from scratch...
Well lets see another implementation of such feature
We known thats skill have variable learn rates in Skyrim and I think there is global variable for each skill thats control such rates.
Another thing there is Guardian Stones powers thats increase rates for certain specialization paths what simulate chose of major skills (45% faster in Oblivion 30% faster in Skyrim) so we can call them "class skills".
Races have certain skill bonuses.
So what can be done there can be script
condition check thats check what skills are protected from fast degradation by
- Race affinity to such skill
- "Class skills"specialization from Guardian Stone
- Number of perks chosen from such skill what also work as furtherer class specialization
- Last time when skill was used or trained
How protection work it create two things:- Guaranteed skill grade what disable skill degradation lower of certain level (for example be Altmer with 60 skill in Alteration, he have +10 Alteration, have specialization from The Mage Guardian Stone and have chosen some perks in Alteration thats require 45 skill points in Alteration he will have guaranteed 50 skill level in Alteration, what will not decrease by normal forgetting over time)
- Faster learn rates if such skill degrade but was on high level (so must advance in slower rate by default) and slower rate of degradation in specialized skills. (so learning skills back will be much easer to specialist then to average user for example Altmer from above was affected by Damage Skill spell effect or was put into Jail for some time he receive degradation of skill to 30 in Alteration normally he will have for example 0.3 rate for learn skill increase at such level but he will have 0.6 form his specialization and last skill level, as well chance thats Alteration will be forgotten in Jail will be decreased)
How degradation works:
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You are not use skill for long time (check of two skill levels current one and for example one month old one) if they are equal and there was no progression from last month learn skill rate for such skill will decrease if it will decrease significantly you will lose level in skill, protection check will apply at this stage.
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You are affected by Damage Skill and Drain Skill spell effects from various source such magical affection can decrease learn skill rates or even increase skill degradation if spell have large magnitude,
willpower and intelligence attribute save can be used at this stage
no attributes as fundamentals force find another implementation for such save or there will be no protection.
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You are put in jail usually jail skill degradation based on random factor and in Oblivion security was excluded from such check, will be nice if there was check thats additionally add chance for degradation of skills on what %PCname specialized since more likely in jailers known who are you and can amuse you with tortures thats damage yours more,
willpower and intelligence attribute save can be used at this stage
no attributes as fundamentals force find another implementation for such save or there will be no protection.
I hope disease in Skyrim will return their fearsome powers so in Jail will be also chance catch disease thats will be hard get rid in ease way how it was in fluffy Oblivion.