everything but: Variable Condition

I was thinking that a condition called "Everything But" would be very useful for many situations. For Exapmle:If you wanted the user to press TAB to advance to the next page and you want any other input to display an incorrect action popup.I know this can be done in other ways, but this would save a lot of time in certain situations and would prevent an excess of variables on pages.If this is already an option within Lectora, I have not found it yet... Any sujestions would be greatly appreciated.

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