Better still, managed to find an easy way to configure to allow partial opening;
Calibration through the switch keys
1) Make sure the module is connected to the power supply.
2) Include the module into the Z-Wave network.
3) Press and hold the switch key connected to S1 or S2 input terminal and release it after at least 3 seconds.
4) Press and hold the same switch key again, and release it after 3 seconds.
5) Now press and hold the same button, for 3 seconds, for the 3rd time.
6) After pressing and releasing the button for the third time, automatic calibration sequence will start.
7) Roller Shutter performs the calibration process, completing full cycle - up, down and up again.
Bingo, works a treat.