[Imp]

My mistake you are correct to produce smoke they need to fire at least half there rockets.
If you have a call time of 0.3-0.5 that wont happen, never noticed as only on map rockets I use are short range stuff like TOS-1 & WW2 rockets & I never fire these at those call times.

May be an argument for rockets having a slightly higher ROF to allow for the fact with new FOO rules its often hard to get a call time below 0.2 even if have LOS 0.5 often does not go to 0.0 on the next hex shift.