Maybe It's a silly Idea, but I'll let it go anyways:
I like RPS in the sense it gaves somewhat historical perspective to the game. People would be able to experience the change in fighting tactics along with changing planes.
On the other hand, I understand that under flat rate, some people want to fly watever they desire in each given moment.
What if, instead of 10 days per year (I would rather like 1 day per month) early years would last much less than last years (i.e., 1939=1day, 1940=2 days, 1941=3 days 1942=5 days, 1943=5 days, 1944=10days, 1945=4/5days)?
This way, most of the time we would be able to fly the majority of planes, and have some time for an early war dogfite time. Maybe even perking planes wouln't be needed, being all late war models and thus, available only for a little time each TOD.
I know that RPS is hitting a dead horse, and, ultimately, HT choice (and I'm 100% confident & satisfied with HT's way of setting this sim, both in actions and timing).
Oh well...
Pepino.