Well, I realize that in many maps where the HQ's are out at the edges, it could be abused....But there has to be one terrrain that it could be tried out on.
Everybody would have to be concerned about a "second front"
Put a (or two) "buffer" sectors, so that if you want to do it...there's a little bit of effort required...and fair warning is given , When you''re off the map...an arrow shows...would it really be that much of a software pain to transfer you to the other side when you hit a certain set of co-ordinates?
A country really getting hammered would have a new set of options to attempt a rebound.
HQ raids are a pain, but they're not catastrophic....(Destruction of cities, ammo factories, etc. should have much more significance....but I digress)...
Maybe they should set up an experimental arena.