Makes sense to me.
All you would need is a message popping up when taking off that your fuel load was 25, 50, 75 or 100%
By the way MWHUN you can set your fuel without going to the hanger.
type command in message box before clicking takeoff direction
.fuel 0           = 25%
.fuel 1           = 50%
.fuel 2           = 75%
.fuel 3           = 100%
Pokie