Two more actions were created for bulk user actions plug-in architecture: bulk user enrolment and bulk user unenrolment. Those two simplify the procedure of enroling/unenroling multiple users to/from the same list of courses with the same roles. Bulk user enrolment also gives opportunity to add the enroled users to the group with selected name in each course (if the group with selected name does not exist in the course, adding to group in this course is just skipped, user is enroled anyway), choose the role to assign from the available in the system (course default is also available and is specific to each course), and choose whether to perform hidden enrolment or not.
Actually there were issues on this topic, like MDL-10002 (this improvement resolves it) and MDL-15449 (this improvement may actually supersede it).
This improvement requires plug-in architecture (MDL-17010) to be installed.