Changing Support Point Totals in Campaigns

[Imp]

Because US/Western units in 2020 to be used for front-end recon tend to be very expensive regardless? And one can't really avoid losing men to stuff like mines or RPG ambushes even with careful advances?

So what?
So your core loses some men big deal you are fighting for that country & they still count towards victory conditions.
in fact think about it logicaly
Bonus from being in the core.
1)They might improve if survive increasing there chances of doing so.
2)You always have spare repair points even on the hardest setting so it costs you nothing.
3)This gives you more support points available every battle.

As I said if you buy regulary put it in the core it should be there & stops you forgeting to buy it. I have seen all the arguments dont buy trucks ammo resupply etc in your core. Trucks are a waste when defending as have to hide them but an experienced truck driver dodges better meaning its passangers are more likely to survive being shot at so they are a good core unit if you use them in any risky situation. Plus a better chance to rally so you can unload rather than being shot at as it retreats & dies.