“Play”, which is about the only useful control the toolbar except for the slider, is located in the lower left corner between two “Move” buttons. On a 17' screen, it is too easy to miss. This makes it useless. I would hate to skip a couple of scenes the moment I wanted to pause just because I missed about 16 pixels.

I can't see the point of “Stop” button. It's not a home video player. If you want to stop the video, just close the window. If you want to pause, just pause. You don't need a stop.

Then there are these “play order” buttons. Come on, do you really watch 20 videos in row? There's a YouTube for that. Useless.

Equalizer?

It's painful to see so little space left for the slider. People use toolbar to scroll through the movie! Finding the exact scene will be extraordinary difficult because unneeded buttons take most of the space.

Do an experiment. Release a beta version that tracks each click. Generate usage heat map for all controls on the toolbar. Make most used items large and simple to hit (place them in the center). Get rid of the rest.

I'm also staying with MPlayerX because of its preferences window. Last time I checked, VLC's preferences were complicated as hell, and there were three different ways of setting subtitle font, none of them working.