I wouldn't mind an all out war mode where you get points for blind fire kills and shooting round cover. They brought this much needed addition into GTA but no one online ever uses it. If they bring a game mode that means you get better scores for using it properly then Online play would be much more interesting.
Right now I don't even bother because it's just full of kids and morons who just want to shoot each other. Which is fine, in DEATMATCH, not Free Roam. I like to be a bit more tactical in how I play my games but that's just me, so no doubt the big guys will be more interested in pleasing their simple-minded fanbase rather than catering for all needs.