Now, I know that, generally, more events are coming for all jobs, but I don't know if these specifically:
1) responding to plane crashes at airports / out in the countryside or the desert (a scene already exists in one of the LV police investigation events, with only extinguishable flames from building fires to be added)
2) using Raindance helicopters to extinguish wildfires in North Rock / Hankypanky Point (LS) / Back o' Beyond / Shady Creeks (SF) / around Bayside (LV)
are on the table for firefighters yet. P.S. for the latter: SA-MP particles allow for the effect of water being splashed to be reproduced, I believe.
Both sound fun & reasonable, especially since there are no FF events set in the countryside at all yet...