If you're going to start adding features, you might want to add a feature request page to help prioritize them. I sell desktop software and the most requested features in that space would probably be license key fulfillment, discount codes, product bundling, and interfacing with CD fulfillment services.
License key fulfillment can be done now using the Snappy Checkout API & webhooks. This process is undocumented right now... but, I'm working on it. In the meantime, I can help anyone get it going via email.
