In one of the BetaBuilder posts, one of the commenters reminded me that while you can customize your BetaBuilder HTML template, it’s not really documented well (or at all).
Customization is pretty simple: just edit the ‘index_template.html’ file in BetaBuilder’s Application Support folder. You’ll find a file with a few simple tags that are used for substitution when building the HTML.
If you customize your HTML file and a future version of BetaBuilder also includes updates, such as for new features, you’ll be prompted to replace your file for the update. It’s up to you to save it off and reconcile those changes.
Any questions? Fire off in the comments.