Idea: sticky/short range nade, does not damage vehicles, but instead damages those inside? Damage is spread among everyone inside. utilized by scout class Countered by getting out of your vehicle. Almost like a "sabotage-vehicle" weapon...
That would be extremely overpowered, and would likely result in RAEG quits after dieing from an ambush once too much.
how about a dropable gas can that produces nerv(/fart) gas which harms everyone in a vehicle on both sides, comms could research "advanced Air filters" for vehicles to become emune.
First off, no teamdamage, I'm afraid. Second, we discussed something like that already, it was rather interesting. It might be used later on.
A just-as-good effect would be to slowly hurt the driver, or blind him. Either way it'll force someone out of his tank. Probably best for the rifleman, too. Reducing tank combat to infantry combat, one step at a time....