Another idea, possibly a fix for the morality system.
I think the main problem is that you get points in either paragon or renegade for selecting their corrisponding choice, seems pretty basic. The problem though is that all the paragon choices make Shepard a pussy, while all the renegade choices make shpard a sociopath. I propse a system based off of Alpha Protocol's dialoge system (BTW, AP is still noe of the best RPGs released in the past few years, fuck you otherwise...) Have the Charsmatic option, the proffesional (nuetral) option, and the agressive, hardass option. And on top of that, have three different variations. So if you dont press anything, you get the non paragon/renegade dialoge, but if you press the left shoulder button or something, you get the paragon versions, and if you press the right shoulder button, the renegade variations.
This is less to deal with the paragon/renegade points, and more for the roleplaying part (as, unless I havent been told, Mass Effect is a RPG, right?) This way, you can have you goody-too shoes paragon and madman renegade, as well as a charsmatic renegade and a hardass paragon.