Consider the steps needed for running an application as administrator using the Start Menu. After searching for the application, your hands will be on the keyboard. Then you have to reach for the mouse, move it to the already highlighted program, and then use the context menu. Turns out that there is a keyboard shortcut for running programs as Administrator from the Start Menu.
First, search for the item in the start menu.
Then press CTRL+SHIFT+ENTER. You will see the familiar UAC prompt.
It is possible to use this method for the programs list on the left pane of the Start Menu as well.
But then you have to select the item first using the arrow keys. In this case, it is probably better to just use the mouse and the context menu.