On the Check Out Guests screen, the drop-down box shows the list of everyone who owes money. It would be nice to identify which people in that list are already PayReady (have a credit card on file) so that it makes it easier to go to that person and process their credit card. Each name could look something like "Smith, John [1234] (PR)" in the drop-down list.

Note that this is in lieu of having a mass card processing operation, which has been requested separately