I added bold to your nerf ideas and italicized your buff ideas. Some may be a push.
Lots of bold.
And most of your bolts are not actually nerf.
1)
that should not be available this early
The carbines are identical to one Rangers and Paras use which are CP3 units so they do come early.
To make thing worse these weapon how low far DPS the range that Pathfinder should use in, changing the weapon with one that is actually long range is an actual buff to their role.
2)
Imo the unit should have its XP value increased currently its price and XP value are far apart and the unit gains veterancy very fast.
The squad has lower XP value than most (if not all) sqaud of it price even member of the MOD agree to this
3)
Replace the scoped carbine with springfield_sniper_rifle_mp if possible
This is cosmetic change since "carbine" rifles are ill suited for scopes they are not powerful enough to be accurate at long range.
4)
Replace the passive critical with a timed ability
see post 20
5)
Add cost of 100-150 MP "Airborne Rally Points" make the detection a timed ability
That comes with more durability the ability to drop weapons and possibly timed aura that justify a cost
6)
Paradrop .50cal M2HB Heavy Machine Gun
Paradrop M1 57mm Anti-Tank Gun
Both abilities moved to beacons.
A clear buff opening room for a new ability
7)
The CD of the ability is simply too low (become even lower with vet 1).
Increase the CD and change the ability and make the ability scale with veterancy instead of getting lower CD.
Check how long is the CD on this ability
8)
Change the ability from aimed to timed so that one does not have to waster in clicking one enemy unit.
A clear player friendly improvement not a nerf in anyway
9)
Possibly make the provide bonuses only when stationary.
In line with role of defensive ability
10)
Increase the CD and change the ability and make the ability scale with veterancy instead of getting lower CD.
Scaling with veterancy is a buff
11)
Planes become harder to shoot down but suffer "suppression" when under fire form AA
A clear buff unless RNG Jesus is on you side.
Feel fee to explain why you though that these were nerfs because I do not really see that.