See, the character I was referring to was neutral evil. If he had been chaotic evil Jaheira would have died on the spot. I even took her out to the surface once (didn't want to waste time, which fits your idea), but in general her brabbling drives me much too insane (or provokes too many chaotic tendencies in my character's mind) and the only solution without killing her would be to silence her which means she can't cast healing spells anymore. Too bad ...
This leads me to a short overview of the different tastes of "evil":
Chaotic evil is basically a psychopathic lawless attitude, often resulting in killing everyone you dislike or just for the fun of it.
Lawful evil means commiting crimes the organized way while using every legal and other loophole you can, much like organized crime or military oppression.
Neutral evil means cunning, playing people off against each other, lying and using violence basically where violence is due to achieve goals.
Concerning the Jaheira situation this could boil down to:
CE: Kill Jaheira at the moment she opens her mouth or sooner if you feel that someone has to suffer instantly because you're in a bad mood, which probably is the case because Johnny just tortured you.
LE: Use her and force yourself to stand her brabbling, then betray her later, eg by ratting on the harpers (unfortunately not possible in the game) and let others kill her unless she gives you a reason to kill her in, uhmm, self defense. Say she summons an animal that you're allergic against ...
NE: Use her if you need her help that bad that you can tolerate her brabbling and get rid of her or kill her later if she annoyed you, which probably is the case because she is an annoying person (the good old druid sacrifice in hell comes to mind).
About the temple thingy: Donating in the sense of bribing is a good idea BUT you're an ascending power yourself. Your only religion is probably your own one, you are your own god and you're probably not going to give your money to other gods without real good reason. NE and LE characters may could find a compromise by stealing the money (or the equivalent in items) from the temple and then donating a small part of it back in order to wash their hands in innocence.
@UU THX for the compliment on my final sentence of that other post. Tiax rules all! Almost ...
