just to let you know i just posted a request for administering enrollment dates in the general developers forum: http://moodle.org/mod/forum/discuss.php?d=26040
it might be helpful if all the RORO folks support this request by in the post above so the Moodle developer community knows how broad the need is. i am at the Moodlemoot outside of Boston right now and Martin said it should be fairly easy since the date is stored in a table. what is needed is for us to describe what is required. i tried to do so in the post above.