I'm happy enough with what you've given us. But since you're asking...
Shortcuts:I just use one media player, that's MPC. Easy to use, simple and fast. Work and watch movies at the same time, thus I find it a stylish benefit having the Zoom shortcuts. The Preset option from Toolbar is there, and would be a great feature to have a simple and easy to remember
shortcut to switch between Standard and Minimal Preset.
A mouse-click is not good enough for some, thus perhaps ability to
re-map some of the Toolbar sub-menus that have not yet been given shortcut?
Fullscreen-only Mouse-right-click OptionsEvery time when watching movies in full-screen, I would be on the bed or couch a few meters away from keyboard, no wireless keyboard/mouse

, and controlling the media using iPod via badtooth or home WiFi. But looking at the mouse-right-click options from a few meters away is a bit challenging. Thus, would be a great comfort to have
simplified media playback menu and larger mouse-right-click fonts or buttons ONLY when in full-screen.
Auto-Docks:Last but not least, would be nice to have the auto-dock to screen edges.
And if you're feeling geeky about it... ability to minimize to that edge (X,Y position) leaving a tiny handle to restore back when click 30x10 pixels (top or bottom) or 10x30 pixels (left or right). ==> Imagine having multiple handles hanging on the screen edges where you can simply pull and watch, or watch multiple at the same time... this highly benefits if you have several favorite movie clips (uh-oh, nudge nudge wink wink) that you wanna have quick access.
Cheers!