Speaking only for myself here, but I think it is unrealistic to expect SD to come up with fixes for every beta that comes along, be it FF, IE or whatever. Much can change during development so it just seem like a waste of resources to chase after betas rather than wait for the release version, or at least the RC. Just my two cents worth.
If the beta in use breaks something or causes a conflict, well, that's life on the bleeding edge.
