i would be good with player height mattering. i think it'd be cool if there was a median height (like 6' for pgs, 6'2 for sgs, 6'4 for sfs, 6'6' for pfs, and 6'8 for Cs) and for every inch your player was above that height, he'd get like a 2-5% advantage. thus, you'd get this weird dynamic where you could recruit a 7'2 guy at d3 who could barely walk and chew gum at the same time. i think a similar thing could be used for weight (although things like weight could hurrt your conditioning, etc.).
all of thinking about this just makes me think how awesome it would be if this site were run by someone who was attentive to detail and motivated. i know just enough people who know enough about programming to know that making changes that made the game much more in depth would not be that difficult. but i can only dream, since they can't really even do the simple stuff around here...