I think having a mod or script that only applies enchant effects and uses charges from a weapon on power attack would be a nice change to the default system, giving you full control over charge use. It would make certain types of enchantments such as: disintegrate, burden, silence, fear and many others an actual strategic use within the game. Might also be possible to do this on bows if charge use = bow drawn back >2 seconds or something like that. If someone already has a mod out there that can do this i'd love to know, haven't found one myself. If not, i would appreciate if this was attempted, I'm also interested in other people's opinion on this subject.