Replacing windows movement functions (move, resize) in Ubuntu Unity (from Alt+mouse_click to Super+mouse_click) is useful for me because when using Blender I need the Alt key to be dedicated for the specific blender functions and I don’t want any overlap of functionalities between Blender and Unity.
To perform this key replacement, you need to install the dconf-editor package first, then change the settings from it.
sudo apt-get install dconf-editor
Next, run dconf editor (find it in the Unity search bar). When it opens, go to the items tree: org►gnome►desktop►wm►preferences and change the value of the field mouse-button-modifier from <Alt> to <Super>