Eternity Engine Compatibility Options Help

[velo1999]

Hello guys! I recently installed the Eternity Engine because of the high compatibility with vanilla Doom and how well it works with megawads such as Valiant and Ancient Aliens. One thing I'm still trying to understand is what all these compatibility options do. In prboom+ I was used to simply applying compatibility using the -complevel command. Is there anything I can do to the Eternity Engine using a command like that? If not, what options should I change in this menu to make sure I have the most vanilla experience possible?

[M_W]

There is a command line option in "-vanilla" that allows the recording of Doom 2 1.9 demos, but Eternity does not support emulating the behavior of old .exe's the same way PrBoom+ does.