I respect the registration process, but when I took over some MrLarmer slaves, I always removed the "must be registered" protection. Why? Dunno, I did not like the feature.
unregged whdload already displays a message and takes more time to start, so I figured: it's enough hassle for unregged users.
The only registered stuff I left is the one on Hacker (Well, now it's time to release the source code)