I would like to provide a feature request that perhaps you can include in future versions:
1. Terms and Conditions checkbox on the sign-up form. It would be nice if we could force a terms and conditions checkbox. Many stores have this option, it only makes sense that this option is available for appointments being scheduled.
2. Registration form improvements: It would be nice if we could re-arrange the signup form fields easily. With the additional fields add-on is nice but you cannot integrate custom fields with the set required fields. Second, it would be nice if there was a multiple option checkbox instead of just one option checkbox. For yes and no questions.
3. Language files: Its difficult to change the wording of your languages. For instance to change: Free, Busy, and Not Possible to our own terms. I don't understand why there isn't a simple lanugage file that I can modify and then re-upload. I know there is a workaround with .po and .mo files but this is not that simple for most users.
This software is outstanding, I just hope these few features will be considered in the near future.