Can’t use fonts bundled with theme

I’m loving the plugin. I was about to give it five stars, but while creating a button using the plugin, I found that I can’t choose from fonts already included in my theme. Greenshift only allows you to choose between Google Fonts and Local—where “local” requires you to upload the fonts in the plugin settings.

I already have the font in my theme. I don’t want to have to upload the font again and have my site load different font files.