Quick assignment of Shortcuts: e.g. Preferences? I know I did it before in 2.80, by clicking some sort of key combination I was able to change the Preferences to Ctrl+Alt+U, as it used to be in 2.79.  

For the life of me, I can't remember how I did it.
I finally remembered, by right clicking on a menu item one is able to assign the shortcut key :)