After talking to our users I've found that they are adding colleagues to their courses as "Teacher" roles to have full course access for whatever reasons (online observation, resource sharing, etc). However, this could create some course role confusion (such as for admin course walk-throughs, etc) when it could appear as if there is a co-teaching situation when, in fact, there none.
To help clear this up I created a clone of the Teacher role and named it "Collaborator." This allows teachers to enroll colleagues in their courses with full Teacher privs but without having anyone see another person listed as Teacher leaving the true teacher with that title role for the course.
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