Keyboard shortcut to toggle inclusion of non-project entities with ... Ctrl+N, Ctrl+Shift+N, Ctrl+Alt+Shift+N

I must be missing something.
To check/uncheck the check-box for including the non-project-classes, files, symbols with Ctrl+N ... keystrokes -- I have to use mouse.

Can't I use a simple keystroke for this? I suggest Tab and space combo.

-Kedar