I agree on more options for clothing and all that for your character. Also, when putting on a hat/glasses, you shouldn't lose them because you get knocked down. If the hat/glasses are knocked off, maybe you can press a button to pick them up and put them back on when you stand over them.
I know this has been said before by many people but I think a female protagonist would be kinda neat but then again, if its not done right, it could end up hurting the GTA Series.