Ubuntu-Mate 14.04: Get rid of Alt+Left-Mouse => move window

Since I’m using blender with 3Button-Emulation (really can’t stand using the middle-button for rotation) I’m heayliy using ALT+Left-Mousebtn. There is always a problem with Linux/Gnome/Ubuntu/whatever.

To make the long story short. Using ubuntu-mate it is quite simple:

System->Preferences->Windows->Behaviour->Movement Key: Check Super instead of Alt

Beforehand I tried all kinds of ways for gnome/compiz… Not sure if that did have any effect:

http://askubuntu.com/questions/521423/how-can-i-disable-altclick-window-dragging