Please do not take it off. You may not have realized, but you have done a great service to the wp community, your pulgin fills a void, just try searching for post order on the wp support forums, and you’ll see how many people have looked for a plugin like yours, as this is the only thing missing from wp which would turn it into a full fledged CMS.
Yes some of its features could be improved, and obviously you must be bombarded with suggestions, but even as it is, it is an unique and precious piece of code.

György