I think it depends on the GM...Personally i allow to do this and the players get bonuses doing it. Or if a bad GM then they get negative modifiers....rofl
I played NWN1 on a hun server (RP) and the maker of the module played with a monk. he easily killed and beated everything in the module by himself alone! Its just a good traits and skill choices thing....
I was recently noticing the lack of good choices for Halfling avatars when creating an alias for a play by post game. A suggestion would be to create avatars from the various races of Golarion books. Any chance of that?