We've just launched a new version of OnSite with one big new feature: DNS Management. Thanks to our Software Engineer Jacob and the rest of the team for making it happen.
The new feature is under Domains -> Manage DNS currently and is available only to account administrators. Using the new tool, you'll be able to point specific hostnames at your local office network, or a blog hosting service, or anything you like. And, if you get in trouble, there's always the 'reset to defaults' option to revert your changes to the records originally created for you.
As always, use the 'Report Bug' feature if you encounter any unexpected behavior or errors. Thanks!