Invisible obstacle/Barrier

[LordOfAles]

We had one until it was replaced by Christmas tree. Such a tool was useful for blocking paths to where player is not supposed to go or to keep an essential unit in place, but allowing it to attack too rather than disabling it. Now to limit movement, we have to use some perhaps unfitting or obstacles looking like clutter. Can we have this barrier, this invisible obstacle back? It can be quite handy for advanced mapmakers like myself.