I've implemented a workaround to check the cursor position when the mouse move event gets caught. This should prevent the video control bar from popping up when there is no real mouse movement. The fix has not been deployed yet, but you should expect to see it on the site sometime this week.
I made some changes to how player preferences are cookied when I rewrote the video player js. Just committed some code that will convert the old settings to the new setting format. This should be fixed the next time we deploy new code to the site.