This page clearly states that Coldfusion Builder 3 has a Tag Editor. How do you open it? It's not on the sad excuse for a tag menu and Ctrl T, Ctl Alt T, Ctrl Shift T don't do a thing. The description of the tag editor is the 7th item down in the first column.
http://www.adobe.com/products/coldfusion-builder/coldfusion-builder-features.html