Yes, I will probably add more functions that will end up going onto a menu. At the moment, webOS phones have a menu with a single function - Jukebox toggle - because the switch just doesn't fit on screen on phone sized displays
But there are still some functions missing from the main app that are available in the web app ( and I don't think any of the other subsonic apps implement them, such as chat? at least, I haven't seen that in any of the others ), that could definitely use some app menu love.
Adding major new features is probably not on the agenda for a little while, though, I'm still working out getting some of the core features operating, tweaked up, and working on trying to find places that I can do some performance optimizations -- on a webOS TouchPad, everything pretty much flies on it, but the PlayBook isn't quite as powerful, so the experience is a little .. lacking .. in some places.
Hopefully you'll like the new update that's awaiting, though. It has performance improvements, bug fixes, and video