Just occasionally, but could organize it a bit more. I just threw together a mission with several target sites and a convoy heading for your base, fairly straightforward. Nice to practice a bit, without those frustrating things like an enemy helo or plane blowing you away (Shark barely has capability to engage helo, none for fixed-wing).
Could post in BS thread when I'm running a mission. Regulars now are Dowly and Lionclaw, 4th slot available, so feel free to drop in... guess I'll add a few more slots in case we need them.