I have the same problem, which I posted on
http://modxcms.com/forums/index.php/topic,11634.msg78224.html#msg78224
My only solution so far was this:
Duplicate the Comments chunk and call it something else (I called mine SubComments).
In the original Comments chunk "comment out" the call to jot with <!-- & -->
In the Blog page where you want the list change your Ditto call to
[[Ditto? &startID=`2` &summarize=`2` &total=`20` &commentschunk=`SubComments` &tpl=`nl_blog` &paginate=`1` &alwaysshow=`1`]]
The downside is that I need to amend the blog entries to target the new Comment chunk {{SubComments}}
It now works, but there must be a variable that you can use to simply turn off comments...Unfortunately I cannot find a reference to it.
Check out www.adrianlawley.com/blog.html to see the result (It’s not finished yet).
Good luck!
Taff