I just accidently somehow activated a parameter widget in the Network View. Not sure how i did it. maybe it was a glitch. but it was a switsh node and there appeared a slider to choose the input besides the node icon. Now its gone. Wanted to make a screenshot but not sure how i activated it. Anyway. After that i realised how coo it would be to have acces to this feature. Changing parameters directly in the NetworkView could be very useful. Has anybody a clue what that was. It looked like a viewport widget.

Are you talking about when you press "P" in the network view?