Here are several reasons it would be useful:

1) If you don't have permission to create new groups but only want one other author to view it
2) You want the option for your authors to post notes and only have their team leader be able to view it (besides themselves). It would be tedious to make a ...

I need to select which users can view which entries. I checked out the new group functionality in 0.9 and it looks great, but I need to be able to select users who can view the post on an individual basis.

I can try to code this modification myself, but I'm not sure if it requires database ...