i have a unique situation we are using rolescoper for.

Currently we have 21 categories with over 500 bloggers.  Each blogger is assigned as a page author to their specific category.  There are also some authors that are page editors for their category, as they are in charge of their categories.  Sometimes, these post editors need to post under another author's name.  Where can I assign this in role scoper?

I currently have everyone set as a subscriber in the user role, and am using role scoper to define their roles, simply because with this many authors, and editors, I want to limit their access to wordpress itself, so they can just post or edit a post in their own category.  If I give the post editors the wp role of edtor, they can post under another author's name, but they have too much access to the wordpress control panel itself, which coudl be messy if they start to play around with settings.

Thanks in advance.

I just read your post again and realize that your main issue is the non-inclusion of WP Subscribers in the Post Author dropdown. This should be possible with the following RS Option is enabled:

Features > Content Maintenance > Filter Users Dropdown

Let me know if that doesn't clear it up.