Alternatively, you could add support for JSDoc style comments, which are easy to write and are supported by other IDEs such as Netbeans (and by JSDoc naturally).
Michael Obermeyer commented
I agree that it would be nice if Visual Studio had native support for this. However, I've created an extension that at least auto-creates the xml comments (no JSDoc support, sorry). I'm sure it's not as robust as what could be created with a dedicated effort by the Visual Studio team, but I'd like to think it's better than nothing, and will hopefully help out until support is added.
Brad Powell commented
This shouldn't have to be requested. It should have been a no brainer. I can pick NetBeans, Aptana, Notepad++ and type in /** and a comment template starts. I know M$ doesn't like anything that is actually a standard but this frustrating to say the least.
Add support for JsDoc comments.