Since I think this should be a thing, here you go. Add this to the bottom of your menus.cfg (Or, autoexec.cfg works too if you don't want to mess with menu configs), to have the main menu appear right away when you start the game:
Someone suggested making it a checkbox option in the settings menu. It would be fairly easy, but I'm not sure if there's much point.
[SELECT ALL] Code:
// Show Main Menu on startup
showmenu main