Add support for hardware per user. In our case, each of our two users has their own label printer, but the labels created by user#2 all get sent to user#1's printer. Shortly, we will also be adding a scale per user, so the same goes for scales - add support to configure scale per user.

All of the above would perhaps be better done with configuration per computer, not user. So whether userA or userB sits down at computer1, that computer will send labels to its label printer, not the label printer across the room at computer2.