by AL Rachels.
Hi Daniel,
Do it the way I do, by using a spreadsheet csv file. Works in all versions of Moodle. You can even use this method if the students are already registered, or not. Even after I do initial enrollments, I keep the file as it can be reused, even if you are only making minor changes to a couple of students...you tell Moodle to only do updates then.
This way will let you enroll users (students, managers, teachers) to multiple courses, assign their role, and enrollment duration. After the courses are over, with a few changes, you can even use it to delete users.
Since you are using Moodle 2.0.1 here is the doc link: http://docs.moodle.org/20/en/Upload_users#Encoding_file_format
Hope this helps,
AL