You can decide, if you want to limit edit-permission in Confluence based on a multi-user picker field in Jira. Lets say you create a multi user field named "page editors" and you put this field in one of your projects, where STAGIL Workflows and Field for Confluence is enabled. With this field you can manage edit-permissions of connected Confluence pages with the following logic: 

To select a customfield for restriction, please make sure that multi user picker field exists and is placed in the correct screens. Then select field in the Configuration section of the app: