Floor decals aren't really needed anymore, since you have FLATSPRITE. All that's needed is rendering of flatsprites (at least non-tilted ones) in the software renderer, in order to say that you have floor decals
Idk if I should post it here but here I go...
I got this error without playing with pwads, just doom2
"Script error, "qzdoom.pk3:zscript/menu/optionmenuitems.txt" line 153:
Unknown identifier 'mCloseOnSelect' "