Yes, but...
Someone who has travelled for a couple of hundred miles to do the trip is not necessarily going to pay a lot of attention to notices - they'll just ignore them!
The trouble is that if you somehow raise the required skill level, do you become responsible for things that go wrong as a result of someone who doesn't come to that level injuring themselves - who may argue that if the rigging hadn't been changed, the problem would not have arisen?
Of course, the flip-side of that is that whoever put in a rope is, in theory, partially responsible for it eventually fraying through / or whoever put in a bolt may be considered responsible if it fails due to bad placement (which may have been fine when it went in) etc. etc. etc..
Both sides of the argument can - of course - be countered by: "it's your responsibility to check the fixed rigging before you use it - and your use of it implies that you have done so; and that you are satisfied that it is suitable for you to use."
My point of view is that if you accept that any rigging someone may have put in (and not told anyone that you did so) should be as simple to use as possible and should be designed so as to require the lowest possible amount of skill, thus reducing the chances that someone gets trapped in there (or worse).
On a more technical note, the second pitch is generally nightmarish. I've heard comments in the past that it should be rigged in accordance with best practice from the roof above, which would require some sort of flying contraption and the ability to shotcrete the flaky rock back to stability!
With that out of the way, the wall to the left (looking down) offers something of a better option, although the wall itself is a bit flaky as well, so it might be difficult to bolt safely.
One thought would be a second deviation somewhere around the overhang, where there's some lovely plastic rope protection bolted to the face. If that kept the rope going over the edge at the protected point, that should resolve most of the rope-related problems, while the slipperiness of the slab could be resolved by hammering a couple of steps out of it.
Not a perfect solution from any point of view, but it would probably work as long as people understand what the deviations are for...
Hello again darkness, my old friend...