I'm not arguing against the E-7, if the improved engine and provision for a droptank etc. are the only significant changes to the E-4 then it could be as economical an addition as some of the P-47 variants we got, I'm definitely be in favour of more early war variants.
I'm also not disagreeing with the point that Guppy's driving at, of course he's right. I'm just saying that the 109T would be different and fun, from the flight simulation and combat aspects of the game.