I am on on the xbox version.

I find it difficult to use the non-cardinal hotkeys, whenever i try to use an item that isn't in up, down, left, or right I always end up using the wrong one because in the heat of battle being precise enough to select the right one is difficult. In fallout 3 I used up for pistol, left and right for my two main weapons and down for stims. I really hate having to pull up the pip-boy to use a stimpack but if I put it on one of the d-pad directions with ammo switch taking up one it only leaves me room for 2 weapons. Is there any way to change the hotkey for ammo switching? I use that a lot less so having it on one of the non-cardinal directions on the d-pad would work a lot better for me.