However, this is not working correctly. With groups and sections in a site, when setting permissions for the TA, there should be the option to select a group/section, (22 automatically sets the group/section that the TA is included in, but allows the instructor to choose other groups/sections/all). On trunk, the instructor is not given that option.
The video shows the behavior on 22 first (which is correct), and then the behavior on trunk.
This is not an issue on 22. When trying to Add Rule for a TA, there is a stacktrace, both in the UI and in the server logs.