Managing Access to Scheduled Issues [4.x]
You can manage access to Scheduled Issue in Add-ons (Security in pre 4.0.5 versions) section under System Administration section:
You can grant permissions to Project Leaders, project roles, individual users and groups.
Only entity (groups, individual users and projects) who have permissions, are able to see Scheduled Issue from the project's Overview section:
Feel free to tell us what topic should be covered: thescheduler@psc-software.atlassian.net