House rule for cooperation of minors etc

[SLAAKMAN]

I thought Id run this by you all. We just finished a 4 map campaign FE with all extra variants. However I find the total non-cooperation rule between various majors and their satellite/allied minors to be somewhat unhistorical along with annoying (perhaps the challenge of it was healthy for the brain though [:D] ). So Ive decided to modify the rule to allow combined attacks (eg. Italian-Yugoslavian/German-Spanish combined attack vs the evil Allies) with a -2 modifier to the attack to reflect the difficulty. Does this sound unreasonable to you or is the idea completely unacceptable? Opinions welcome. (Dives for cover).

[Froonp]

Only -2 ?
German & Italian fighting together already incurs a -1 penalty, so I think that -2 is not enough.
Except if it is -2 per non cooperating participant, in which case it would be Italian-Yugoslavian/German-Spanish at -1 for Ge / It, -2 for Spanish / Ita & -2 for Yugo / ge, that is -5.

Anyway, I think this is too much of a hassle, and I think that RAW is better (non cooperation).