The tracer rounds look like big red baseballs floating through the air.
My apologies for getting it wrong. Camera film tended to make tracer trajectories into blobs, IRL and on digital the trajectory looks more like a series of streaks, a bit like a skyrocket in flight. And, yes, it is strange to watch, especially if the camera is jumping around between frames so that the tracers don't look like they're following a straight line.
If it's possible and easy, a nice touch might be to give users the ability to create the analogue film artifacts like camera vibration, lens flare, depth of field problems, and analogue film artifacts like blobby tracers or uneven propeller blur where you can sort of see the prop blades as they move. The screenshot and video guys would love you.
A simpler and more important feature is the ability to allow users to change color or intensity of light effects based on external triggers. For example, tracer color varied between countries and periods, engine manifolds might gradually glow red hot, and color of flames coming out of the manifold might vary based on fuel/oxygen mix.