Always possible. However, this component doesn’t use the official API. The official component is the way to go forward if you want to use that API. We may expose access to Alexa specific devices, but I don’t think it goes to exposing every device Alexa may interact with. Guard was exposed since it was Amazon specific. We have to be conscious of how often we hit the Amazon API so we don’t get banned.
For your Schlage Encode, your’e better served by directly interacting with its API since it’s probably a local API. I have no idea whether anyone has figured it out though. EDIT: Check this thread.