Why ?
Seems to me that moving everything onto custom posts defeats the object of using wordpress.
If you cannot use the functions, plugins and great
seo facilities that wordpress offers you might as well have a non
wp classifieds site built specifically for classifieds.
Very disappointed in how classipress seems to be getting bodged and codged and so called "improvements" which just give more headaches for siteowners who continually have to come to the forums ot try and find answers and then play around with code to try and get them to work.