So I invented it a little..
Disqus can manage "reactions" beside of comments. Reactions are tweetbacks: I found one in my testblog. It is not able to manage trackbacks or pingbacks AFAIK. So I try to hide comments and commentform only, if the template supports this. Most old do, 2k11 did not but will.
Now I have "2 comments and 1 reaction, 1 trackback" in the footer area of my post.
The trackbacks are still managed by s9y.
BTW: It is *
very* important to give the blog shortname, not the DISQUS username as plugin option. Else you won't see the reactions and you can not divide the comments of different blogs. I made that more clear in the English language file.