We played Star Fluxx, Star Munchkin, Dixit, and, of course, Bomb Alley.
Is such an animal exist?
18.5.1 Forage Raids says:
Lt units may raid enemy areas only
22.1 Neutrality says:
All Neutrals except Britain are friendly to the Coalition at start.
Belligerents may never attack or besiege friendly Neutrals...
It seems to me that there's no express prohibition of such raids (and you could always say afterwards those Lt units are an unruly lot).