As far as zoom goes, I'll zoom up to frame the HUD on my screen during an attack, but I feel that it's not cheating since it's about the same resolution and SA I'd expect from RL when focused and on a task. (FWIW, I use a 32" tv at 720p)
As far as labels go... Maybe to compensate for our natural acuity at picking out moving objects IRL, smoke/dust on moving targets should be more obvious?
My biggest problem with maintaining situational awareness in game is getting my bearings after pulling off an attack run. Missing all the little cues that you'd get as far as spatial awareness (vestibular system, sun, etc.) add up and I find myself slightly disoriented. "Great, where's that SAM now?"
I would suggest that if you center an object in your FOV at a reasonable range for a period of time, you get a persistent label and the target is effectively "spotted"... the closer the range and the longer it's been centered in the view, the more obvious and informational the label. If you don't reacquire the target in view often enough, the label should diminish until it's gone again.
IMO, it'd be a fairly realistic way of simulating the process of spotting and maintaining SA over targets that's otherwise difficult to capture with a sim.