When creating new portal site, there are 4 permissions to set - Access, Edit, Move Apps, Move Containers. When I create new portal and set some permissions, then create new page in this portal, the owner of the new page is the newly created portal, and Access and Edit permissions are inherited or "copied" into the permissions of the new page. But Move Apps, Move Containers permissions are set to "Everyone". This permissions should probably also inherit the permissions from the owning portal. Steps to reproduce: 1. Create new portal site, set some permissions 2. Go to this new portal site, create new page. On the 3rd step of creating the page, in View Page Properties, Permissions tab are inherited only Access and Edit permissions.
This cannot be fixed as suggested in the description because there already are defaults applied from the selected page template. I have created Bug 1094154 to fix some small inconsistencies in page creation forms.