remove "REVERSE" option from pane settings when options are boolean

One of the great things about using selection rules or visibility rules in panels is the option to negate a test: the "REVERSE (NOT)" checkbox option. But when the choices presented to the end user are boolean (YES/NO or Exists/Doesn't exist) the reverse option doesn't make any sense.

It would be great if there were a way to adjust the UI based on the options provided, removing the REVERSE option when necessary, so the questions presented to the user make sense in all cases.