Even if that wasn't against the rules, it wouldn't do any good anyway. All of the data files in the Echelon version are encoded, so having the full-version 1ST_READ.BIN wouldn't make a difference.
diablo2121: This only works with the full 1GB image. I don't know of any methods that allow you to burn 1GB to a 800MB CD-R. What would be great would be to figure out how Echelon managed to pack the files down, and what code they injected to make the DC decode in real time. This might be a bit of work, but you could modify the full version with the editor, extract the files, encode them, create a new image, and then play that on the Dreamcast.