To deal with problems with spammy comments, I just added support for Facebook comments. This serves as a fallback mechanism - if you're not logged in with Tabulas, and the user has enabled it, then you can comment with FB directly. 

I'm not totally sold on this mechanism, but the alternative is writing a lot of code to deal with spam, and honestly, that's not a great solution. 

Let's see how this works. I definitely need to spend some time cleaning up the commenting options, though. It's a mess in the control panel!