Hi,
since there is assist mex to build mass storages around mex, maybe make it for massfabs too. (not sure if i would use it though)
And since powerstorage is on pgen hotkey now, maybe put t2 massfabs (and not t3 massfab!) on mex hotkey. I know that everyone has massfab templates already, but sometimes you want to make some massfabs adjacent to your facs, for example setons air slot, or just fill some spaces.