Commons tool permissions chart should have some permissions chosen by default

The Commons tool does not have any permissions turned on my default, so before ever using it, the instructor needs to access the permissions chart and turn on their own ability to post. If they do not assign permissions, students will not be able to post, either.

No other tool requires initial permission set-up by the instructor. 

I believe we need to enable at least the most basic visibility/posting (a la Blogs, or Resources) since no one would enable this tool without expecting these basic permissions.

My first attempt at /TA to post - update - delete own, read and delete any. 

Allow student to post - update - delete own, read any.

Thoughts?