/vr/ - Retro Games

How can one start GZDoom with the -fast parameter already applied for any new maps?

I know I can start a specific level with -warp <level> -fast from outside the game, but I'd like to have a toggle from the GZDoom menu that lets me enable/disable -fast mode.

Even better would be an extra difficulty setting below Ultra Violence, that said UV Fast.Pls, I would be eternally grateful if some ZScript wizard could make this tiny universal mod.