I am playing on PC.
The current weapon/item hotkeys are assigned from 1 to 8. Maybe adding more—like 9 and 0—wouldn’t be a bad idea?
Iirc, old diablo 2 can have shortcut key to belt slot using F1~F16, you mean sort like that?
Though it gonna be really sxck for consoles, coz we don’t have that many button on our joystick 
haha, yeah. I use xbox controller as well. It doesen’t seems to be a problem i guess.
Nevertheless, development stopped, so any wish will be unfulfilled.