I apologize in advance if this has already been stated. I usually try to read all of the posts before providing my opinion and insight but I'm short on time.
As was stated by several in the beginning of the thread, I don't think we need to change regulation on visual approaches. Why? Because it's already there, though rather hidden in the FARs if you ask me.
§91.129
subpart (e) for large or turbine aircraft.
I'll use my paraphrase because I think it gets the point across more than the legalese of the FARs.
It states if you have an approach with vertical guidance, even on a visual approach, you must remain on or above glide path between the FAF and DA. So to me this is stating you really need to have the approach in there and using it. Otherwise how can you guarantee you are above the glide path? You could do the math using DME I suppose, or the PAPI/ VASI but that could lead you wrong for confirming the airport.
In this case, if they had done the math from the GPS or whatever else, they would have realized something was off. If they had briefed the ILS and didn't even tune it in they would have realized they were staring at a VASI when they wanted a PAPI. And finally, if they had actually used the approach as I interpret the FAR, none of this would've happened.
But hey, I'm on the ground, not moving at 250KTS, and I've had a lot of time to think about this, even look up FARs. Mistakes do happen. They will continue to happen. There's gotta be at least one more with the rule of three. I'm glad this one was uneventful and I hope any to come are the same.
EDIT: I do notice they only have an RNAV on 14 so that does nix the precision glidepath. I'm sure the plane is equipped with some sort of RNAV, but if not It would definitely make it harder to brief an approach for backup.