Thanks!
It sounds like you’re using the correct DTH for this app and your lock. Some other publishers have made DTHs for locks other than the default SmartThings offerings, and have also included the hook that’s required for this app. “Z-Wave Schlage Touchscreen Lock Reporting v2” sounds like one of them!
I think that having users listed in the SmartApps section of the lock device screen is perfect. It makes the user more aware of who has access to that device in more places. I don’t think it harms anything at any rate.