If you go into spectator mode, and press v to bring vehicle creation dialog up and try to use it, crashes to desktop. Not an important fix but should be taken care of eventually (like when all other bugs are fixed and all features added and gameplay perfectly balanced and you have nothing to do)
I thought some time ago that this dialog box is for changing setup after leaving VF. (I forget to bind arty gun quite often) It doesn't work outside of VF nor in VF. I lose expensive arty just because it was bound last time (and ie. HE is not available this time).