You did not miss anything. It is not possible to create your own template in SmartOffice 2 at this time.
We have this item on our list of features to add to the app, but unfortunately, I cannot predict when we'll get to it. We have a few major enhancements we're working on for the next release but I'm not sure we'll be able to include user created templates.
The engineering team reads this forum too, and I've set the topic of your post to "Enhancement" from "uncategorized".
Thank you for posting.