I'm just curious which skills people would like to play with, but, due to something broken, can't use. Lemme get the ball rolling with a few of mine:
Deathblow/Death Strike/Hammer Mastery: I'm not sure if these abilities stack; it'd be nice if, when wielding a Deathblow (5) maul, you could have up to a 15% chance of instantly killing something. However, thanks to insanely high spiritual resistances, these abilities are more or less pointless. I understand noncorporeal critters like spectres resisting this, but why do rats, bees and snakes have some super invulnerability to getting their heads thumped?
Spear Mastery/Boomerang/Spiritual Warrior: Spear Mastery is nearly reasonable as far as cost/damage goes, Boomerang and Spiritual Warrior are rediculously expensive. Could these abilities work with the enchantments on the weapon? If you had a Mana Drain (5) weapon, that would alleviate the costs tremendously (and you could hurl spiritual and fire damage weapons around).
Summon Vermin/Summon Skeleton: I'm not sure what the point of these skills are. Neither summon has any staying power, and why would I want to summon just one skeleton when I could summon 5? And why would I summon rats at all? If the rats had something that made them worth keeping around, I'd love to see it. Perhaps they could release a cloud of poison when killed (plague rats)? Suggestions?
Pickpocket: Beyond its arguable use in one quest, you never get away with this, nor do you get anything good that you couldn't just trade for. The risks of using it are also too steep. Could there be some way to give NPCs an inventory of things they won't trade, but could be lifted off of them? Guards would be less willing to give up their weapon, but if it could be nicked while it was in their scabbard...
Other thoughts?
