Hello.
I have found the solution.
If you have terminal access to your diskstation, you could edit the file:
/var/packages/AlarmClock/target/app/config
and add after lines:
“allowMultiInstance”: false,
“allUsers”: true,
the new line:
“grantPrivilege”: “all”,
Then, you are able to setup access for any user to this package,
in user privileges settings.
Or, wait some days, I will make new version with this feature.