I think the fuel burn rate of 2 was put in to limit the usage/effectivness of the LA7.
It certainly limits the Yak and 205 also.
I doubt if a burn rate of 1.5 would give us an arena with droves of 205s, Yaks and LA5's. But certainly it might increase their numbers, and therefore the diversity of planes you see.
As for being a simulation. Well yes it is. But an arena where a PonyD has a Dora flying wing is hardly realistic. I mean we have Pony's shooting Corsairs off a Zeke's six. What are we simulating in the MA??? Certainly not historic WW2 scenario's, go to the CT for that. We have a pretty good main arena, just trying to see if there are other options for game-play.