Slalanc01, as you've already read above, CloneDVD won't do this for you. However, I'd like to offer an alternate suggestion... Have you looked into VOBBlanker and MenuShrink?
I use VOBBlanker frequently to remove everything except the main movie and the main movie menu. Then, I use MenuShrink to shrink the menu down to just one still frame (but maintains the button functionality). Lastly, I use DVD Shrink and remove all the foreign language audio streams. Often I can then fit a DVD-9 disc onto a single layer DVD-5 disc without any compression on the main movie files.
Keep in mind, this won't always work as sometimes the main movie files alone are still too large for a single layer disc, but it does frequently work well.