Been using them of late.
I dont see a difference in their speed when they come out of ambush. Giving them brens also dosnt seem worth it tbh.
They are quite expensive and come out at 3 cp.
You can get infiltration commandos that only have 3 modals for 320mp still costing 35mp to reinforce the 2 extra bringing them to 390mp.
Glider which cost 390mp, yeah you get the glider but you really get it for the commandoes.
Forward logistics glider, 540mp. You get aload of goodies like the landing officer but who really has time to build commandos costing a further 350mp.
And storm troopers cost 340mp and come at 2cp,33 mp to reinforce.
Also digging through their vet, they get
vet 1. smoke grenade
vet2:25% accuracy and grenade range
vet3:10% received accuracy and drop smoke on retreat (also self heal).
No cooldown bonus in sight.
Edit: I think stormtroopers are fine as they are. Mayby giving them an ambush bonus like commandos (probably would need to be abit weaker) would suffice replacing focus fire.
The whole point is the cool ninja factor. Smoke and they are gone.