I've copied the file HTML.tmbundle to the folder "/Users/richard/Library/Application Support/Sublime Text 2/Packages/" and re-started Sublime Text. The behavior I'm hoping to replicate is in TM's "Link from clipboard" snippet, which creates an anchor link around the selected text and sets the href attribute to the text on the clipboard. The trigger to create that link is Control-Option-Command-A. It doesn't work in Sublime Text.
Am I missing a step? Is there any way to duplicate that behavior in Sublime Text?