I don't feel like I have enough experience with this game to offer any opinion on their use. But from a historical perspective, if they are to be used accurately in the game, they should have good recon capabilities. If they are given any attack ability it should be weak or have a probability factor similar to the espionage missions, with low probablities of success or low damage. And they should be vulnerable to infantry intercept.
I'm speaking "should" from a "how would I modify them" standpoint.
I'm speaking "should" from a "how would I modify them" standpoint.