Maybe you can already do this, if so please let me know how, but at the minute in SilverStripe you can set the Access options for a page to be accessibly to a specific group. However this setting doesn't pass down to Secondary, Tertiary etc pages below that page.
Scenario, I want to create a group for a set of people to be able to edit one page and it's subsequent siblings. However if they create a page without setting the Access options to just be their group, people in other groups can edit that page.
Potential update to silverstripe?