On testing another patch I wondered why you can't select/unselect all patrons in a patron list to remove in batch. I think this would be a useful enhancement, as this seems to be the point of preferring checkboxes over a delete link. Also, why name the button "Update" when the purpose seems to always be deleting?
Hm, also sorting on the checkboxes in the first column doesn't seem to work.
I rolled a fix for this into the broader Bug 11671 so I'm marking this as a duplicate. *** This bug has been marked as a duplicate of bug 11671 ***