I believe there are 19 states that can be e-filed compared to less than a half dozen when it first became available.  So little by little they are expanding that feature.  But for what it is worth, I don't file many amended returns but when I do I have never had any issues with a client wondering why the Minnesota amended return couldn't be e-filed.  If a client gets that bent over shape over that issue, they really aren't a good client to keep around.