I'd like to suggest implementing another mode of library synchronization. In addition to having synchronization work globally on all the folders, I think it would be great to be able to do a selective synchronization on only selected folders.
With this feature, users don't have to wait for a global synchronization if they've added only a few items to just one or two folders.
Just wondering: the unsynced tree doesn't do it for that purpose?
At the moment, no. I use unsynced libraries by default and if Advanced Library is running when I copy new items over, I either have to re-start Advanced Library or re-sync the libraries to refresh the items lists. It's only then I can see the new items I've copied over.