The problem with making such a system Cariss is the fact that such a gunner would be utterly helpless against Push, Pull, or Lightning unless they walk, which makes it easier for the Jedi to cut them down AND makes it harder to use that exclusive flamethrower in the first place. It's not as fair as you make it out to be.
Something like flamethrower should not be exclusive. It isn't powerful enough for that if we talk of exclusive vs. exclusive.
Exclusive Flamer vs. Exclusive Lightning: Lightning wins, because it can inflict knockdown and thus helplessness, leaving a person open for a finisher saber.
Exclusive Clone Rifle is not very good against Jedi, because speed of attack is irrelevant against them considering the fact that Bowcaster can't penetrate their defenses for a good while.