I tried the same as @gavacac proposed with the zwave.me/Popp/devolo scene controller, but this only lead to blinking light (constantly on and off). Only the approach as given in the link did finally do what I wanted (toggle). The button report is always ON, so I ended up with the additional variable ...

Maybe you give this a try: viewtopic.php?f=62&t=20683&p=174002#p174002

I found a way to do this, but is not really straight forward. I defined a variable for the switch and use the value of the variable together with the button on scene controller to change the state of the switch. I hope you get the point. IF ((button==ON) and SW1Var=="OFF")) THEN SW1=ON ELSE IF ...

I have exactly the same issue, I just want to toggle a light.
I think the problem is that the button on the scene controller is reporting on all the time.
Did you come to a conclusion?