Hi people.
Why not do a army force support call?
I mean a call for squads from other bases of your faction that coming to your location?
That will provide a lot of help than paratroop call.
But with a lot of cost. (Any ai squad that accept the call, will cost 200 rp.So, if you have 400 rp and you make a this call, to your AO will come only 2 squads.)

AI squads will come with seek 'n' destroy mission to your AO.
After coming, AI squad leader start 1.3 minute timer. After time is up, squad leader will lead his soldier back to the base.

Also, it is should be available for high-ranked player and mini-bosses.
It will prevent squad spamming.
And at least one AI squad should come if that call appear.

Mainly it will useful if assault is stucks.

sorry for my poor knowledge of the language.

One way to mod it, at least, is by spawning a dummy vehicle with the call, possibly invisible or maybe make it look like a flare, that has protectors value set as many as you wish the commander AI to allocate troops to that location.