I personally see no reason Malware Removal folks should be involved (unless they help on the technical side too) or be concerned (once Combo-fix is removed). But I do wonder if you shouldn't narrow your focus by ensuring this is a "Windows Repair" tool and not intended as a security/malware removal or prevention tool too.
I agree that TDSS Rootkit Remover is an excellent tool and could stay as I believe the odds of further damage by an inexperienced user is minimal - worst case. But while I would argue "the normal user" could safely use TDSS, Rich (Ztruker) is right and at some sites the MR folks might (as they do with ComboFix) balk at it being suggested outside the (typically closed) Malware Removal forums.
And to that, Rich and I go way back and visit many forums on the "technical side" (HW, Windows, Networking, etc. - not malware removal). And sadly it is often the case where MR controls, or desires control of every and anything to do with malware - whether it be prevention or removal - because of the chance the untrained "normal user" may cause more harm than good. Thus only certified malware removal folks who completed an on-line MR course can suggest or manage their use. Certainly, HJT in the hands of the too-eager did result in dead systems, way too often. But that was awhile ago and when you are in the trenches surrounded by infected machines, it is hard to believe the vast majority of the 1 billion Windows machines are NOT infected. And many that are broken have a corrupted driver, a failed update, an incorrect setting somewhere. Or a real hardware problem - totally unrelated to anything malicious. Or sadly, suffered collateral damage from deployed malware, or the malware removal process itself. Or an over-eager user trying to free up too much space.
So while TDSS RKR is a great tool, not sure I would call it a Windows Repair tool. And to that, I am not crazy about specifying a specific anti-malware solution. I like how you say, "(In case you need one)" - but I think, if you really think it necessary to address security in this "Windows Repair" tool, just recommending to "get a good anti-malware program and keep it updated" prevents any unwanted opposition/tangents over which is who's favorite (ie, generic, like Step 1 of your instructions).
I see your tool as a "consolidated" Microsoft FixIt tool. A good thing! But I truly believe if you want the greatest acceptance of your tool (in terms of folks like Rich and me recommending it on the technical side of the forums), you need to narrow your focus to Windows Repair and remove any context to security and malware. JMHO.