Anyone here played Morrowind?
It\'s single player, but it uses a skill based system to advance; if you fight with a sword, your sword skill goes up; if you run a lot, your acrobatics skill goes up, and so on.
You have to level 10 skills to go up one level, then you assign points for strength, agility, willpower, intelligence, personality, and whatnot.
The twist is this: you only get three points to assign. But if you levelled a lot of skills that have strength as a primary attribute (i.e. fighting), then you get a multiplier to strength. So you can put 1 point into, say, intelligence, where you don\'t have a multiplier, and go up by 1, or you can put it into your strength catagory with a 3 multiplier, and gain 3 pts of strength.
It lets you raise whatever skill you want, but it encourages realistic character growth.
The problem with that system is you end up trying to perfect EVERYTHING.
But just another possibility to consider.