Well, somehow I got it to rotate the mission after it's been running for two hours now.
Mind you, it runs for two hours if nobody is using it, so nobody gets killed, nobody bails out... So at least we won't be caught at night around there anymore!
Hm, after doing some more flying around on the server, in the cool company of Jabo, Gypsy and Arthur, it kinda looks like the first pil2ot that kicks of a trigger, and gets its aircraft downed (including bailing out first), will force the mission to be rotated... The perfect Friar style of hosting this is!