JS: Stop "CTRL" + "?" to open Shortcut Window

Is there a JS-master out there who can help me out?

"CTRL" + "?" opens up the Shortcut layer. How can I make Storyline stop doint that? Which code line in what JS file do I have to remove to do that?

The problem is: On a german keyboard "CTRL" + "?" creates a "ß"-character.
I am building a typing interaction and - as you can image - that is problematic.