We've had a couple of people suggest similar ideas of this. If we had designed this at the beginning of the game, we could have probably come up with some neat mechanics to add to the game. Unfortunately, if we added it to all of the maps now, it would really through off the balance of the game and make it too easy (aka boring).
However, it maybe something we could add as a future to one specific map that has been designed to balance well with it. I've added it to the list of things to think about for future maps.
Thanks for the thought!