Game variation suggestion

It just struck me as kinda odd that if for example you own all of Oceania on a standard world map, all your reinforcements can be magically deployed on a single territory in say Europe or the US if they're not directly connected. Has it been thought of before now to limit each territory bonus to somewhere WITHIN that territory/region? Might make an interesting variant if you can't parachute in umpteen millions onto a small area, they have to deploy on their home turf then fortify to the destination.