Going with a Weapons Fire Resolution system that would let them control how various behaviors would effect how well or badly your 'mech can hit the target you're indicating would make it easy as pie to make jumpsniping what it should be - a desperation tactic. Doable, but DARN hard, and you can forget picking what part of a target you want to hit and reliably hitting it.
In tabletop terms, you have to incur +6 on top of anything else to do a fire of opportunity shot while jumping... that's a STEEP modifier.
As far as third person view; it can be done well and balanced vs first person. Just don't render anything that the 'mechs visual sensors cannot see (targets AND environment), wireframe non-visual sensor contacts variably based upon quality of sensor contact, and you have parity.
Edited by Pht, 28 December 2011 - 06:10 PM.