That list would be found on an internal file server at Cakewalk, never to be made public.
Granted, we know about many - perhaps most - of the bugs from forum discussions and the "known problems" section of the X1 readme.rtf. But bugs that have been reported by users and not discussed here are officially privileged communications between the reporter and the company. If you've ever received a problem report acknowledgment from CW you'll have seen the standard email footer that expressly forbids you from discussing any emails or passing them on.
It's not that there's some nefarious conspiracy afoot. The company simply reserves the right to decide which bugs to fix and when. It is therefore understandably reluctant to discuss requested fixes that have been blown off or postponed.
In all probability the best you'll be able to do is come up with a list compiled by some diligent user, but it will be incomplete.