Yes, it is the QPPS value. The Roboclaw uses the QPPS value to determine the correct feedforward value automatically(you dont enter it other than setting the QPPS. QPPS is just the maximum speed of the motor in encoder counts per second. The simplest way to determine it is to run the motor at 100% duty and read out the speed.
Note that the autotuner will determine a reasonable QPPS setting automatically.