Isn't there already a form of standing 8 in place? I think it's more a matter of too few refs having the presence of mind to use it.

Take the same knock down punch landed in the center of the ring vs. one landed with the receiving fighter against the ropes. In the center of the ring, a fighter will go down and further punishment is stopped, therefore giving the stricken fighter a chance to recover, usually an eight count. Against the ropes, a fighter is often held up to take more punishment and leaves the ref no choice, or the appearance of no choice, but to step in and save the stricken fighter.

However the ref does have another option, and that is to rule that the ropes held the fighter up, and step in to give a standing 8 count. I'm pretty certain that I've seen this in fights where it was stated in the rules that there is no standing 8?

If I'm right, It seems like there really is no need for a separate standing 8 rule, just a better understanding of the present rules by more refs.