Look for the section "Opposite (switch between C/CPP and H files)" fairly easily to do what you want, and then bind it to a keyboard shortcut. this lets you customize it to exactly what you personally want, which is much easier than VA trying to support everyone's separate desires.
I just updated my VSHelper add-in on Codeproject - http://www.codeproject.com/macro/VSHelper.asp. The Opposite command is now customizable, with default switch order .h -> .inl -> .cpp -> .c -> .h. Also the // ## prefix is customizable. The latest version contains binaries for VS2003 and VS2005.