There is query limit on .ORG's whois server, so the application waits 16s between each request.

No. If you buy Domain Whois Checker, you'll get lifetime license.

No. Registration key will work only on the one PC.

The demo version has full functionality to test all features, but limited by domain name quantity. You won't be able bulk check more than 20 domain names in demo version.

Yes, you can.
Open server list, click on the "Add zone" button and input TLD name (without "." (dot) ). Then add a corresponding whois server and choose the parser.

No, this requires professional programming skills, so we haven't included a parser creation interface in our application.
If you need a custom parser, just fill in this form. Our developers will create it as soon as it possible.