2. Allow a quick an easy peace option on any planetary object where there are two or more player factions that happens to be at war with each other. To make it easy for ground forces to not fight each other on a specific body like say Earth but allow them to fight on other bodies. This would help immensely for multiple faction Earth starts.
If both factions at a body have their forces set to Rear Echelon or Support, they will not fight - though I agree that I'd like to see this changed, as you may not *want* all your forces on Rear Echelon even though you don't want to attack a hostile power you share a body with. It'd definitely help with things like Genestealer Cults and Imperials/Rebels, in which it's expected that even though the powers are hostile, they may coexist for some time.
How I houserule around this now, is that I'll have two separate factions - say, the Genestealers and the Tyranids - with the Genestealers (neutral) gifting the Tyranids (hostile) ground units, and now, whole colonies. This can also work for neutral powers that "join" the Rebellion after reaching a certain diplomacy score or meet some other criteria. The "ruling" faction can "root out" the insidious neutrals by completing geosurveys of "infected" planets. I used to houserule that this lowered diplomatic relations with the neutral faction by a certain amount, and at a certain threshold, you could consider them hostile and wipe them out with your military forces, but now, I might just have "discovered" colonies be gifted to the hostile faction immediately.
Those are my houserules, anyway, though again, I agree with the initial point.
