[dogscoff]

But when creating a new race and IA, under what mod shall I try it ?

All of them!
Seriously, any mod that you like. If you really enjoy Devnullmod, then do an AI for it. Why not? It's a good mod with lots of interesting options for an AI modder.

Will this be an AI for your pexlerr shipset or is it something new? Looking forward to it, whatever it is =-)