Rep. impact on attitude of NPC/traders in general towards the char => yes, I'd like that as well. Though... how would gamers take it, if they are at disadvantage then? Lady_Rain, do you think this then would be called a restriction? And would a gamer take this if she/he not only has to pay higher prices but might be not showed special items? I'd love that myself, as I could feel more integration in-game (actions causes consequences) - but if I remember gamer reactions from those who didn't use the disguise armour in Act 1 and had no quests/skills then due to hostile NPC - hm, I think, they were not happy.
Hm, Arcanum had a system with traders who really were affected by your reputation and your magic/technical abilities.
You could be trown out of shops if you didn't have the appropriate rep (Example: thieves shop goes: "What are you doing here? There's nothing of interest here for you", if you're not a member of the thieves underground; or techies go "Go out of my shop, I don't want any mages in my shop").
Also civilians got mad and attacked you if they caught you stealing their items or opening their chests.
I liked it.
I still have some moral problems stealing from the poor guy who can't even pay the doctor to cure his sick daughter and makes you look for the cure.
At least then you're actually punished if you choose to do this.