I can't figure out how to add more than one footprint to a Schematic Library Component.
Yes. This one is quite simple. Double-Click the component in your SCH Library editor and it brings up the Library Component Properties window. In the bottom of the window, you have models. Click the 'Add...' button at the bottom of the window. Select Footprint and click 'OK'. Now select your library path or keep it as Any, depending upon where you keep your libraries. Then browse for your Footprint Model. It should bring up a picture of your selected footprint. Click 'OK' and now you have the ability to select multiple footprints for a single component.
Thanks James. I just realized that the previously selected footprint does not get overridden by the new footprint choice, but rather gets nested into a drop-down dialogue in the models section beside the footprint category. Confusing, but once you know how it works is trivial.