FPS issues are you kidding me? LockOn runs on my comp at a steady 40+ ~ FPS (after 40FPS I stop noticing any difference) on uber maxified complete awesomeness settings.
Why not just give all jet engines a slight heat blur. I know the heat bluring is based on a slider, why not just give it a little bit. Same goes for afterburner, give it a miniscule amount of heatblur ALL the time so it doesn't look like a polygon cone.