Allow editing function problem

I am having a problem with the Wiki (v 1.0.9) privileges/editing option. When editing is restricted, it works great - no editing options. When editing is allowed (i.e., Site user) it is all or nothing - - not only does the "Edit" tab show as you would expect, but the "Edit this entry" link also view-able, which allows the user to edit the Wiki permission settings (see attached screenshots).

Also, when the "Edit" tab is clicked, "Enabling e-mail notifications" and "Allow editing by" permission choices are showing. Is this how it is suppose to be? If so, is there a way to turn off access to the permission settings so the user is limited to only editing the content of the Wiki?