Hotkeying Exos is a bit of an issue for me.
Now normally I am a big fan of hotkeys, and really have nothing against it in principle, however, the fact that it takes a turn to swap means hitting the wrong key can have really really dire consequences.
I know there are ways around that (like not using the hotkeys), but it may have been part of the consideration in why they aren't there.
On the other hand, I would like more hotkeys in the customization screen, as well as making RMB the same as ESC for quickly backing out of screens. The main issue I have with the UI right now is that the location (left hand side) of the icons is very far away from the center of the screen, meaning a lot of mousing in some situations where you are stealthing/swaping/whatevering.
Then again I've not been playing for that long so I will no doubt be missing some things which make it easier, but honestly, I'd prefer to see the 4 exos on the bottom of the screen, you can leave the rest of the stuff on the left.
Alternatively I wonder just how possible/easy it is to make screen layouts customizable for the player