is there a solution for the sync problem???
At this moment in time, if you cannot get sync to work could you please use containers for the time being. I'm starting to think its nothing to do with the RokuRemote or the music servers, but the roku devices themselves not being able to handle a load of commands in very quick succession (I've had a few reports back saying that thier Roku devices just reboot themselves). Sync on-the-fly will fix this due to a reduced amount of command being sent, which I would hope wouldn't kill even the oldest of roku hardware.
As for the other queries, I will certainly add search/alphabet indexing to the containers list (PS: g12345: bit confused by your query as container support was never in v1.x)