I've suggested that when designing maps it would be good to have the possibility of creating one-way connections between territories (e.g. Territory A can attack Territory B, but Territory B can't attack Territory A). I've modelled maps on a chess game and a transport system, and both have connections like this which I could't recreate. I think it would open up another tactical level of play, and some interesting possibilities for future maps. If you like the idea please vote for it on the UserVoice forum:
http://warlight.uservoice.com/forums/77051-warlight-features/suggestions/2355553-one-way-connections