The never dying historical aces are really killing the immersion for me, so what I would like to propose is that the devs add a switch in the workbench. An on/off switch that would allow the player to decide if he/she wants to play with the historical aces as is or to let them die like the rest of us.
I play a lot of online games and whenever WOFF comes up on TeamSpeak this is the number one complaint. The second most frequent complaint being the inability to take a leave of absence to advance time in your career like Albert Ball when he took 4 or 5 months off between his first and second tours of duty. Players like to follow a pilot through history but its not practical to do on a 1 or 2 missions per calendar day pace in the game.
A time advance feature and the option for mortal aces would be huge improvements