Just little something I did while digging through stuff. Just put it in autoexec.cfg
//Quickswitch Menu
bind p OpenQuick
Alias OpenQuick "+quickswitch; bind p CloseQuick"
Alias CloseQuick "-quickswitch; bind p OpenQuick"
Its a menu they put in but using it the default way makes you hold down the button while using it. When you have it open use numbers 1-5 to switch which slot item you're looking at. It's a faster more seamless way than opening your backpack loadout every time.