Is the Temple+ launcher supported by Galaxy 2,0 ? Does anyone know ?

Why wouldn't you execute the mod from a command line?

I suppose you could just manually add it to your library. Don't have any firsthand experience with Galaxy, but I know that's a thing you can do in the new version. But I'm pretty sure it won't automatically detect and add any separate community-created launchers created for running the mod; you would have to do it yourself.