Another idea for this plugin (which would also require a plugin options page) would be the ability to select which font libraries to enable. Eg. if I only want to use Font Awesome and not Elusive on my website, I could select just the one I wanted.
This would result in the CSS file of the non-selected library not being added tothe <head> section of each webpage, which would save a bit of time and resources in page-load (obviously the fewer files that need to be loaded up, the better, and it's always good to be able to remove unneeded files from loading!)
Good idea? :)