Hi. I love this plugin sooo much! However, my host, wpengine, has disallowed it. I asked them for their reason. Here's the answer:
"The big problem is that it relies on FULLTEXT indexes on MySQL. This doesn't scale, so it can really get out of hand."
If you could fork a version that didn't do fulltext indexing, I could see if I could get that version approved by them for use by their customers. Interested?