Members Directory not showing comments

We are running the Members Directory plugin and all settings seem to be available except allowing comments to be listed on member profiles. When I go to Network Admin >Network Settings there are options to show posts and show friends on user profiles, but there is no option to show comments. Posts are showing up fine on profiles (with Post Indexer) but users comments are not (with Comment Indexer). I was assuming there would be an option to "show comments" on the settings. Any help is appreciated.