CoursePro change slugs won't take

Hi,

1. I'm trying to change the names in the slugs - student & course don't work for us. Everytime I change it, it reverts back to the original name.

2. Every page of CoursePro seems to use the single.php template. Is there a way to have other templates for some of these pages so content can be added above or below?

3. If #2 is no, why is the single.php file not bringing in my sidebar? It does on the main page for the courses, but not on the login page (for example)

Thanks!