So i got tired of playing my good char and started an evil one. Seems to be difficult though..

I helped Cobb take over Goodsprings and while he says other powdergangers (in Primm) will attack me the extent is a bit.. weird. Ok, so maybe word of my affiliation has not spread to everyone yet.. But on my way to the correctional facility i encounter some hostile powder gangers, and upon killing thenm i get villified with the faction. .. Seriously.. wtf.. them being hostile i can rationalise, but not faction karma dropping..

I guess what im looking for is a mod that does something long the lines of : Oh, you heloped Cobb take over Goodsprings? well, from now on powdergangers will act as the NCR does to "good" charaters.

What the point of bein evil in a faction syste that does not recognize it?

EDIT: Fallout 3 might have had a lack of an evil route in terms of gameplay changes, but atleast what little evil you could do in the wolrd there integrated with the story.