It's a good idea - will look into it for the next major version.
In the meantime you can do something basic by adding the following in qa_home_load_ifcategory(...) in qa-page-home.php:
After:
$qa_content['custom']=$custompage['content'];
Add:
if (qa_get_logged_in_level($qa_db)>=QA_USER_LEVEL_ADMIN)
$qa_content['title'].=' <A HREF="'.qa_path_html('admin/pages', array('edit' => $custompage['pageid'])).'">[edit]</A>';