Add permission for changing the priority of a case

Hi
I am using open atrium with casetracker module (i use beta 8 version, but it looks like in beta 9 it's the same)
I need my customer to change the priority of cases
i didn't find any info about it in the permissions page, nor in the issues queue here
found this http://drupal.org/node/128377 on 5.x version , but this doesn't look like it found a way into the 6.x version

Thanks