I am loving the theme editor. However, it would be great to have the ability to add a different font family to choose from when under the advanced editing section of the theme editor. I realize the most web friendly font families are included but I still would like the ability to customize it. We already have the option of creating a custom family when adding text in the form builder which is great.
I would normally just go into the css files and edit the font family directly, however I don't think we have this option. The way it is set up is to link in the header to the css stylesheet (e.g. <link href="http://www.tfaforms.com/themes/get/11764" rel="stylesheet" type="text/css" />. I suppose I could always remove this link and embed the css styles into the header section of the page and then edit them there but that would add a lot of unnecessary bulk to the page.
Have you tried just adding CSS code to your custom code block to change the appropriate font-families? If you use the !important CSS declaration modifier, it should overwrite the styling form the CSS files.
Let me know a form you're trying this with, and where you are after you try the above, FormAssembly.com Support.