I'm finding a lot of things aren't automatically syncing on my Android phone until the folders are rescanned. That's not a problem because I have it set to rescan every 5 minutes, and I can force a rescan if I need it to happen more quickly, but it's a bit tedious having to go into the Info menu for the folder, then the Preferences to get to the Force Rescan option. I'd love it if there was either a button to do it next to the info buttons on the folder list or, better yet, a button to rescan all folders on the notification area, next to the sleep/sync button.
Edit: I just got a new phone and don't seem to need to force rescans anymore. I guess it was just because I was using an antique. Still wouldn't mind this as a feature though - there's bound to still be some times when a manual rescan will help.