The main reason I want to roll stats is not to increase my primary stats, but to avoid lowering secondary stats in a way that feels non-rp to me. I can accept that my hero has average intelligence--below average, not so much. I also seem to be unable to enjoy playing a character with below 10 strength--not because I want them to hit things harder, but because of carry weight and jumping distance. Feeling that I have more racial choice would also be great.
Although, rolling comes with risks. Roll the dices six times and say you get following results: 16, 5, 8, 18, 10, 11. Then choosing which ability get which value means that two of your stats is gonna be sub-par. But, and please correct me if I'm wrong, I got the impression that's exactly what you don't want. Or, do you mean that you want the rolling to work like it did in BG2 where you could roll endlessly until you got stats you were happy with?