Change durations in Play mode -- alternative methods?

Are there any methods of changing note durations in Play mode other than by mouse-dragging note ends/beginnings? (E.g., key strokes, or - as for velocities - actual value inputs)

(What a great program! )

When you’re in written durations mode, you can use the regular key commands: Alt+left/right to move the note according to the rhythmic grid, and Shift+Alt+left/right to lengthen or shorten the note. But there aren’t at present any shortcuts to adjust the start/end offset when in played durations mode.