well, sort of. everything works on the kodi gui itself (py or sh scripts as favorites) but 3rd party apps that connect via API do not handle it well. (like yatse, openhab...)
I guess they expect some media in favorites, and RunScript just breaks them. yatse claims invalid favourite, and some of them it cannot even see....at some point they even crash kodi by attempting to "play" scripts or whatnot.
so I gave up and I am doing kodi-send --action='RunScript and Playmedia - from remote machine, its good enough
ok so if you r doing kodi send you can still use party mode...here you go:
Quotekodi-send --action="PlayerControl(Partymode(/some/path/to/a/file/Soundtracks.xsp))"