I think the ability to lean left and right while aiming down the sight would be a great idea. For instance, omit the cover button. Instead, while aiming, the bumpers (R1 & L1) could be used to lean. Either that, or find some way to make it so if you hold R1 while pressing some sort of direction(maybe even a toggle until you press the cover button again) to lean. Maybe if you're not holding down the aim button, the bumpers function normally. Personally, I hate the cover system. I'm in the military, and I've never been taught to put your back against the wall that you're taking cover behind. If you could just crouch, and use the "lean" button to peak over cover/obstacles, that would make the game way better in my opinion. Let me know what you think.