It would be nice if - when a player is connected - there is a more prominent sync button, perhaps on the main UI along the top or bottom.
Currently I use locked tabs with musicbee so to sync music (which I do often) I have to open a new tab, select my player from the side, and then click sync (then close tab again). Not sure if many others would like this, but I'd even take the ability to configure my own button to sync.