Jukebox mode is a good possibility to administrate music events from "outside" an event center.
that means one person (SUBSONIC client) can supply many people with music. (e.g. music hall administrated via DJ area).
Like for music szenarios we would need this jukebox mode for video representations too:
==> Play video directly on the video device of the Subsonic server <==
(start Subsonic server's default video player (instead of client's default video player)
that means one person (subsonic client) would be enabled to show movies to many people (seating/dancing before a video wall).
Jukebox mode for video would be great for systems like HTPCs whose console screen is replaced by TV/beamer/video wall (not only for private use at home but also for use in congress etc.); such a system often has to be administrated via net
of course jukebox mode for internet radio is missing too...