Apparently I can't reconfigure, no changes persist. It always resets to zero.
(BTW I can't use much of the keys on my keyboard. Tried "í" for previous weapon, which is next to shift, but it won't persist)
Hell, it looks like I can't reassign any keys anymore.
The lack of text on the UI arrow button is also worrying. It shows "ok" for example for the custom controls section without modernizer.rez, but changing keys doesn't work here anymore as well.