One feature that I have been missing for a long time is a simple shortcut key for pause and play. For example F5 or Space.
Now Spece/Enter do the trick IF you have the Play/Pause button activated, but if you have for example just adjusted the volume, Space/Enter do nothing.
Also good UI design requires that all the functions that you have on the UI should be accessible without clicking with mouse.
Best answer by ratty
All the shortcuts are listed in Help/Keyboard Shortcuts.