Well, in RL the tracers could be set anyway you liked. A common setup for Marine pilots in WWII was tracer, AP, Incendiary, AP, Tracer, Which is 1 in 4. I agree witt the large cals beung set at 3.
It would be nice if this was a setting in the load out. I'd like to have tracers for the low caliber guns like the 303s and the 7.5s and not on my cannons. Would like to be able to set tracer frequency also.
Yup, I'm dreaming, I know.