Group Page Security - how it is handled by SF

I have a role which can only edit certain pages in a site.

Now when logged in with that group only the pages I have rights to edit will be editable. If I click on any other page simply nothing happens. 

But, if I click on a group page I get into edit mode and only on save am I told that I don't have the rights to change.

a) am I doing something wrong
b) if not a) I think it would be nice if grouppages would behave the same way. Nothing happens when I click on them
c) to me it would make it even more clear which pages I can eddit if the Icons for publish (green with white checkmark) would be grayed out for all the pages I have no rights to modify.

Now its only blue titles vs. gray titles.

Screencast : http://www.marktold.com/screencast/sf_grouppage_security.swf

Markus