Thanks for your feedback! For the call waiting feature, you can click the avatar on the Wave app -> Account Settings -> Basic Information -> Extensions -> Features -> Other Settings -> then, you can disable “Call Waiting” by unchecking the option.
For the time format feature request, I think you meant you want to add an option on the Wave app:
After clicking that option, the Wave app will sync the time format setting which has been configured in relevant UCM63xx. I have reported this feature request to our dev team today, and our Wave develop team will collect more feedback from other users and consider this suggestion in the future release. Thanks for your testing!