Would be nice if it would be possible to make a house to house alliance with other houses, making it acually impossible to attack eachother.
It is really only needed to prevent the few people that just attack anyways to attack the allied house which really is not good for the alliance.
It should always be possible(for the houseleader)to cancel the alliance at any given time making it possible to attack eachother again though.
I belive there is something like that in mind already since there is the "At Peace" thing in the house description?