It seems, permissions can be set on individual comments in theory... How can this be done in practice -- and before the issue's reporter and watchers are all notified of the new comment by e-mail?
Our old (home-grown) issue-tracking system has a checkbox on the comment-entry form, which allowed support staff to mark any comment as "internal" -- marking the checkbox would hide the new comment from the issue-reporter and other users not in the tech-support group.
Now that we are migrating to JIRA, this is the only feature, for which we have not found a replacement... Any hope? Thanks!