I hope that Airnav considers the Bell 407s proposal about have a version with blank unencrypted database.
When you say a blank database, I presume you mean with all tables empty (actype, aircraft, airlines, airports, routes).
Secondly, if you want to run with a blank database, and have autoupdate turned off, then surely you can operate like that at the moment. Keep an unencrypted version of your navdata, do all your manual updates on that unencrypted version. Take a copy before you start-up Radarbox. Next time you want to manually update the database, close Radarbox, update your unencrypted version, take a copy, and off you go again. And if anyone needs a blank, unencrypted database, I have one.
Personally, I would rather Airnav devote their precious development resource to bug-fixing and features that would appeal to the majority of users.