HI @ProfessorBeyrer
The option to suspend the user is not in regards to their Course enrollments, but to their login. An admin can suspend a user and they will not be able to login to Canvas anymore. They remain enrolled in all their classes, just can't access Canvas.
If students were added through SIS, teachers can't remove them from the course. Maybe you can find an easier way for the teachers to remove the students from the course from the school's system, and on the next sync, the students would be removed from the course in Canvas.
If the students were added manually, you can change the permissions for the teachers to be able to remove students from the course.
Thank you for your collaboration.