Guys, thanks for the continued prodding for this feature. We've decided to add this to version 7.5, which is currently in beta test and is just weeks away from full release. On the flight plan page you can touch the Add Waypoint button, and now you can enter a big list of codes separated by spaces- not just one. Just make sure you have "Codes" selected, and not "Full Text Search". Also you can select either "Airports" or "Navaids" or both. If both, you need to be sure and use the "K" for all your airport codes.
Thanks for the suggestions and feedback, keep em coming!
Walter