I don't consider myself to be the maintainer of Mupen64Plus. I merely hacked the scripts and added PickleLauncher support. I do not want to personally upload this to the repo since no-one has previously done so. You are fortunate I have it easily available from my web space in the meantime. The idea is that bzFrank or anyone else actively working on the project itself can put the "stamp of approval" on this and upload it to the repo.