it should change without needing a game restart

Cannot reproduce, toggling print screen classnames from the Q menu then navigating around menus works for me.

By chance, did you have the dedi server open at the same time? The stupid nightconfig filewatcher/"config is not correct" stuff tends to make one instance of the game try to "correct" the config file while the other instance is writing it, constantly resetting everything to default and breaking the Q menu too. Only relevant to dev instances.

uhh, no dedicated server, but I realized I was using an updated version of forge, that seems to be the problem, in .3 works as intended.