Personally I would consider leaving it as it is now, but make it overwatching only teritory captured by royal arty player (like hold the line ability). It will not affect 1v1 at all, but it can help in cheese vp drains in above game modes (at least you will be able to move anywhere, not just sit and watch your 120 vps going away because somebody just pushed the button).
I understand where you are coming from, tho woudln't it be very random? I mean you have to think who captured now this point? Also normally IS is rushing forward, while soviet, usa is capping the points behind...