Sneaking during a battle? Or sneaking in general?
If a character has 1 in sneak and does this sequence of events:
Step 1: get all enemies facing one direction (this is pretty easy)
Step 2: Stand behind one enemy and end each turn in sneak
Step 3: AI will stand there at the end of every one of your turns doing nothing
.......You can exploit this to beat the entire game with fists if ya want. The AI basically can never find you and thus never targets you in combat for anything...letting you just wail on them over the course of each fight as long as you end your turn in sneak each time.
Might as well tell the AI never to attack anyone, right? Why make me hit the extra button and take that much longer?
EDIT:
Don't even have to move. Just hit C at the end of each turn with your last AP. Instant immortality