how do I configure livesplit to use in game time? I set up the autosplitter in "edit layout" i found linked here (can't find the link again right now though). It says to use a launch option to use in game time but I don't know where to enter that

right click > compare against > game time

Don't use that autosplitter, use the one in the edit splits menu, make sure to remove the one you manually downloaded.

That said, yeah you need a launch command, you can set it up in the steam properties like this:

oh, the launch command is for the game. that's the part I didn't get.