I just bought the game when I saw that I could finally rebind keys. Turns out most important keys can’t be rebound. For example, Mouse side buttons, Tab, Esc, ‘`’ (the key under Esc in US layout).
Usually, I don’t want any critical keys to be used for low priority actions. For example, the current Tab menu, I don’t want it on Tab. The menu itself can be REALLY far away from the buttons I use to play, somewhere like F10 tends to be really common.
Please, allow us to rebind all keys as we need.
Hello, thanks for the report. This is on our radar and we are working to get the feature in as soon as possible. 
Hi, I just reinstalled in time for the Breach update. I see most keybinds are now fixed! Thank you so much.
However, Tab is still hardcoded to the quick menu, which isn’t useful on PC because we can have so many menu keybinds.
Are there any plans to fix this? At least let us rebind the quick menu hotkey so we don’t press it by mistake (I normally have the targeting button on tab, or weapon swap depending on how important weapon swapping is in the game).