The easiest way I can think of to do this is to set everything that gives you experience to give you a 0 multiplier. (But I don't know how to do that) This would effectively just nullify that entire system, and I'd be free to use scripts on enemies that modify a global "EXP" that is registered for ondeath events, getting the player closer to levelling.
Basically I'm trying to make Skyrim into an engine for making 3D DND games, so I need experience to be gained through killin stuff and accomplishing quests rather than by using the means to those ends.
Any thoughts?
