Hm, well, to avoid letting people switch just to get those perkies for the winning side, how about just not giving perkies to those who have flown for a country for less than 12 hours?
That is winning war perkies, I mean.
Shouldn't be too hard to implement. Or maybe it is, i dunno
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Baron Claus "StSanta" Von Ribbentroppen
9./JG 54 "Grünherz"
"You filthy piece of distended rectum! DIE allierte schweinhund!"