I wrote 6 brief paragraphs of advice and realized I was recommending the creation of J2O's download section. I may not understand what is meant by JCS "ladder." I will say that I sense that level design is principally uncompetitive.
I did save the notes - but I think that what I had in mind is just something less efficient than sorting by rating.
One more thing: a well-executed system is very beneficial to both level designers and game players.