I have the same switch and also have been looking around for guides to add the switch. But i find som much different solutions that did not work.
But after finding this manual http://www.vesternet.com/downloads/dl/file/id/1147/product/2105/z_wave_me_wall_controller_2_set_installation_guide.pdf
the button setup got a bit more clear. As most other guides say go to management mode and press button 2 or 3, this manual is saying to dobbelpress button 1.
So what i did to get the switch working, was
1. Add device
2. Generic Z-wave device
5. Press all 4 buttons for 1 sec to enter management mode
6. Dobbelpress button 1.
The switch was added. But not detected as a switch. If you wake up the switch by pressing button 2 during management mode, it updated the switch to actually be a switch. Now you should get the option "Select scenes for device buttons" to add scenes for the buttons.
Hope this helps.