Does the sneak attack or sleight of hand check need to be in the same round as the modified withdraw?
ex1: You grab the unattended idol and stash it on your person.The guards notice it is gone but not that you took it. They initiate combat. Can you withdraw as a move action and use the standard action of the first round for something else? Does the withdraw in this case have to come first?
ex2: You 5' step to get a flanking position but the enemy falls to your first (sneak)attack. Moving is not an option this round. Can you withdraw as a move action next round? Does taking a move equivalent action spoil the 'fast getaway'?
