using the workflow transitions it is possible to disable commenting on an issue in certain statuses.
ie by putting jira.permission.comment.user = denied ...
Check the j-tricks blog on this subject
The disadvantage is that if the user wants to progress the issue to another status he/she will not be able to provide a comment (because the permission has been disabled)
Putting a transition specific permission (in the transition properties) doesn't do anything.
Any idea's how to fix this