ctrl–alt–shift left/right arrow
Roll marked selection in the active waveform to the left or right. Only the amplitudes will be shifted, the timing will not move. You will be prompted for the direction and number of pulses. First time you use the keyboard shortcut, a dialog will ask you the number of steps, and that number will then be used until you invoke the command from the menu (not from shortcut). Choose ROLL SELECTION from the menu to get the dialog again.

Example: “roll right by 2 pulses” means that the following operation will be performed twice: the last pulse will be moved to the first position and the remaining pulses will be shifted right by one slot.