> I think I mentioned this several months ago. But when I 
make
> a project with several websites in it, frequently I want 
to
> add a new site to a project, but not try to crawl an
> existing site. So I would like a way to comment out the
> existing site, and only add the new sites to my project. 

This is not possible with the current design: links have to 
be rebuild "globally" - it means that cross-site-links are 
built on the fly so that you can jump from a site to 
another one on a same project. 

You can however add an additional URL to an existing 
project, and choose "Continue an interrupted mirror", which 
should be faster (and should not touch the existing files)