Well, we can load Scala files from the Scale box on the Tuning pane. Scala has many of these tunings and more. The general site for Scala is:

http://www.huygens-fokker.org/scala/

You don't have to have the program to use files that have been created by it. The download for the several hundred files is at:

http://www.huygens-fokker.org/docs/scales.zip

Once you unzip the file, you click on Pteq's Scale box and then navigate to their folder. (And lose many years trying out these tunings...)

Be aware that these files were created and named by many different people, so you may want to go to (or download) this description of the files and do a Ctl-F search for specific words:

http://www.huygens-fokker.org/docs/scalesdir.txt

For example, I'm trying to learn more about a specific Victorian tuning right now, but only one file has the name "Victorian." However, doing a search led me to file descriptions that indicate several are meant as variations of the scale. (But I'm not sure that any of them are giving me the sound that I've been hearing...)

http://74.125.47.132/search?q=cache:8S4...=firefox-a

And the timeline on page one, showing the popularity of the tunings and the composers lives, is a nice touch.