I would love to see a feature added into the android app (and iOS app i suppose. I don't use it but I'm feeling generous ;p) that would allow you to select which wifi network is your "home" network. Ideally this would allow you to tell the app to "Auto-sync" whenever you connect to this network (preferrably with option to specify "only when charging").
I don't know about anyone else but, while I do want to have my media syncronize automatically, I also personally have no desire to ever sync media with my phone or tablet unless I am on the same local network as the server (it just takes too long over the internet). This would solve this problem rather neatly.