At any rate, when I first saw 'no combat', the word 'stealth' was screaming all over my mind,
Diplomacy was what hit
me first. Trouble is with RPGs including the ones that have implemented Diplomacy and Stealth (the fallouts and baldur's gates to mention two), XP is mainly gained by killing opponents, and some boss fights are unavoidable. Which makes stealth/diplomacy alone a non-viable route, as you will end up with less experience and combat skills in those unavoidable fights that are tailored against combat oriented characters.
Sorry, but I have sometimes real problems to divide irony from real intentions.
Do what I do: Consider everything sarcasm and irony until proven otherwise <img src="/ubbthreads/images/graemlins/winkwink.gif" alt="" />