This is looking great! can see a ton of work has gone into this update and thanks in advance to those who have put in the effort.
Seeing EM being one of the deprecated mods, reminded me of one the small quality of life changes it included which could perhaps be considered for FAF itself.
That is, assisting a paused mex with engineers, will unpause that mex so that its built in build power doesn't go to waste. I know it is common for players to shift click paused mexes with a group of engineers, this would simply make the process more efficient.