In reply to Brent Jett.

Ha, this exact thing was going through my mind while building this. I was like, wait, I can add text-transform and font-variant too. :) I had to stop myself from going down that path.

For my own personal use, I'd probably allow a few font-family choices for entire groups like body copy, headlines, etc. Maybe add some limited font-size choices. I don't know for sure though until I utilize it in a practical application.