It would be great if you could specify in the settings how many tracks to play when you click the "Play Random" links throughout the app. Right now just 10 tracks is simply too low.
Also...a little workaround for this at the moment is to enter in the address bar:
javascript:top.playlist.onPlayRandom('\\\\Station\\Audio\\Hip-Hop\\Atmosphere',50);
This will load 50 random tracks for the specified location.
For added convenience, you could add a bookmark to Firefox and enter the following:
Location:
javascript:top.playlist.onPlayRandom('\\\\Station\\audio\\Hip-Hop\\%s',50);
Keyword:
subsonic
This way, all you would have to do is type the following in the Firefox address bar while you have Subsonic pulled up to play 50 random songs from the artist you specify: subsonic ArtistName