There are contextual menus on four of the transport buttons accessible by right-clicking them. They work on the transport buttons on both the Transport window and the Edit window if you have the Transport function option selected from the View menu for the Edit Window.
Play - This shows the options for the Play button.
Half Speed – This is the same as Shift and Spacebar.
Prime for Playback – When playing back a large number of tracks,
Pro Tools can take a little while to actually start playing back audio. To avoid this delay you can put Pro Tools in Play Pause mode (Prime for Playback) so that when you do hit play you get an instant start.
Loop – This is the same as selecting Loop Playback in the Options menu and enables Pro Tools to play the same selection as a loop to help select a good loop point.
Dynamic Transport – This is the same as selecting Dynamic Transport from the Options menu.
This shows the options for the Record button and you can see that you can get to any of the record modes from the one contextual menu. As with most of the right-click menus there isn’t anything new but they bring together all the relevant options in one little menu.
Return to Zero & Go To End (HD only)
These show the options for these two buttons and they enable you to access automation commands that you would otherwise access from the Automation window.