Hey @AppleCore,
Unfortunately Keyboard Maestro's ability to drive the mouse is essentially the same as what the user can do, so you can't click on items the user can't click.
Tell us in more detail what you're trying to do. It might or might not be amenable to scripting.
And – If you haven't read this then take a minute:
Tip: How Do I Get The Best Answer in the Shortest Time?
-Chris