Connected Trench Systems between Allies?

[Orac]

Breaking alliances would leave you with a sudden link to the enemy, am I correct? It is not entirely a problem, because all players involved have the same chance to get themselves wiped out by the enemy at the other end of the trench. If there was an option, in a similar way to the Build off allied Conyards, a "Build off allied Trenches" button in the multiplayer/skirmish screen then I'd see that as a solution to that "weird behavior".

But it does seem like a really good concept, and would probably make having allies a more attractive thing to have, rather than a parasite who takes all the tech structures and won't give them back