I heard a great line once:
First specialize, then generalize.
Thing is to skill 1 profession and unlock the new skills, after that you take advantage of those skills in other professions.
But Coz allready mentioned such, a few posts up
Got laser rifle as main profession myself. I fired with the bravo a few times in thin air, so not alot of plasma wep skills, still it's just a few levels (about 6) beneath laser rifle. The additional skills and unlocks do their job ok.
Fire away,
Rap