How will the airspawns be treated/distributed?
I'd remove the fuel restrictions personaly, especialy with a 2.0 fuel burn rate.
I would keep a reasonable altitude restriction, nobody wants to spend all night repeatedly climbing back up to 30k, especialy if 999000 is going to be one of the buffs up there that they're going to keep having to climb up that high and far to face.
Guns/cannons only, so we want bomber intercepts to not have access to the german air to air rockets or so we don't want the allied escorts to have access to air to ground munitions?
As for auto bombsight calibration... I don't know, you will probabley want to add more wind and other difficulties for buffs that opt to take the high-road and also add an incentive for bombers to stay lower to the ground, use your judgement to best achieve this I think.