I don't think it's a matter of "not allowing", so much as airfield design criteria did not address it at all. For some people that is an open door, but for others it is an excuse to say no. I and many others have operated this way many times, but I have also been told no more than once. This provides a path of clear compliance with the FAR, which may have insurance ramifications. I also wonder what freedom ATC would have to allow such operations on a controlled field without clear guidance on how to operate. The FAA puts a lot of effort into preventing runway incursions, so I doubt they want Class C and D towers making up their own procedures and ground layouts without some kind of effort to standardize.