Enable autoplay
QuickTime will automatically start playing the video after it is opened.
Show subtitles when available:
If the video has subtitles they will be loaded by default.
Remain in full screen when QuickTime Player is inactive:
As default QuickTime X will exit fullscreen mode when becoming inactive e.g. switching to an other application.
Allow simultaneous recordings:
Quicktime will now be able to perform simultaneous recording from multiple sources such as web cameras.
Show movie controls:
One can chose to view movie controls Automatically, Always or Only on open. Automatically is the default choice.