Once the controlling strat's buildings are all down you have 15 minutes to get 20 troops into its map room. But, just like Stalingrad you are fighting a war of supply, resources and will power.
Have up to 3 train lines and 3 truck convoy lines that supply the strat. 1 train and truck convoy runs every 3 minutes from each depot during the 15 minute countdown. Make the strat resuplyable by land and air. C47's and(M3/any supply vehical) . Once the last building is flattened then every train and truck supply convoy recovers some number of auto and manned ack. Every air and ground supply drop recovers auto and manned ack. For 15 minutes no buildings come back. But, the ability to shoot your attackers and troops does. During this 15 minutes every convoy or train you kill delays the ack and manned gun recovery. Every (M3/any supply vehical) and C47 you kill delays auto and manned ack recovery. You will not need ack down once all buildings are down to capture the strat. Just 20 troops alive in the map room through the defensive fire and rubble.
When I say ack and guns - Puffy auto, feild auto, feild mannable and manable 17 pounders. Auto Flack towers near the center of the strat even.
Once the first buildings pop then you have to start over again. With the first building all ack and guns will pop and you start over. Make the truck yards and train marshalling yards destroyable but well hardened. They should respawn in 5-10 minutes. For every air drop or GV supply delivery have some number of ack and guns be recovered for duty. During the fight phase to get all the strat buildings down have the supply trains and convoys equally add to recovering auto ack, guns and buildings. Air drops and manned GV drops only give you auto and manned guns back.
So a tank would be able to camp the train yards and truck yards or just sit on the track or in the road. Well a jabo can fly the tracks or the road. Freindly GV's can camp the yards and roads to protect them. GV's can camp the GV spawn points. The yards can be hardened and have auto ack to keep bombers and jabo honest. I'm thinking the same auto ack strat already have. This is why GV spawns from the surrounding bases are located to not allow a Tiger or Firefly to spawn and setup a camp of the nearest GV spawn in under 5 minutes.
This almost sounds like it would take so many assets to accomplish that winning the map would only require capturing one of these from the other two countries before they do it to you.
This would give bombers and jabo real targets to affect the outcome of the map along with the possibilities of some mongo GV battles for realestate. A map could be setup so that CV's come into play to resupply the strat or take back the sector bases behind the attacking country to facilitate resupply of the strats guns. One of the big island maps we currently have would work.
Because no spawns will come out of the strat to the sector bases, it can be ignored during the initial conquering of it's sector. Or, if a squad really gets it together. Bomb the strat and the surrounding marshalling yards to dust in one huge bomber raid and follow up with 20 C47's with troops. But, if they didn't bother to take any of the other sector feilds first. It would be re-flatten the buildings and sneak 20 troops in through the ack fire while they mess around with conquering the rest of the sector. Who controls the strat owns that sector.
NOTE:
This is just an idea and I have no idea if it will work or if HiTech even cares. I'm trying to keep to the idea of localising the pain and keeping its duration short to promote 24x7 conflict and combat.