* Remove the "sync_mode" dropdown from timeline header, and move it into the Playback menu instead. * Remove the confusing "Frame Dropping" and "AV Sync" entries from the Playback menu. These were supposed to be mutually exclusive (or else, the "sync_mode" menu would break). * Turn AV Sync on by default * Commented out the Frame Dropping and Av Sync RNA Properties too. THere doesn't seem to be any valid reason for these to exist?