Personally, I think it's a crock myself. I can see the reasoning behind it, but, then again... why give an individual an instructor's rating at 15 or so hours.... and then tell him he can't instruct?
As I said though, the FBO where I train made the "executive decision" to let these two CFI's be included on the insurance for the twin ... I *think* because they did most of their training there IN the twin....
I could be wrong though.
Hell, if you have 200 hours of multi - frig instructing - go for the regionals.