honour, do you have a saved game at the start of act II/end of act I?
if so, i'd suffer the loss of time and reload - this time wear the disguise!
for me a lot of the fun of these games is the quest solving (or trying to solve! <img src="/ubbthreads/images/graemlins/biggrin.gif" alt="" />) and i'd hate for you to miss this stuff!
keep this in mind...AFTER you've fulfilled all or most of your quests, you can then remove the uniform and wander through again, this time killing everything in sight.
this way i was able to finish all the quests, but also got all the loot as no one was left alive in the citadel at my departure.
these games needn't be an "either/or" proposition - do 'em both! <img src="/ubbthreads/images/graemlins/evilgrin1.gif" alt="" />