I'm sure you're aware that, if you do your edits in the "Floating Window" and not the "Show in Main Panel" window, the left and right arrows at the bottom perform this function. When you arrow to the next or previous track, your edits to the track you were on get saved. But, just in case anyone else doesn't know that, Floating Window works this way.
This is the main reason why I hardly ever do edits in the main panel.
For consistency, arrows could be added to the "Show in Main Panel" edit window, and that way they'd both act in the same way.