in plugin Actions for JIRA Service Desk there is option to add transition to customer portal with transition screen and you can also use global transition to allow editing issue for customers. You can add only priority to screen. Here you can find instruction how to do it: https://intenso.atlassian.net/wiki/display/SPFJSD/Edit+issue+in+Customer+Portal or you can change priority on transition screen. Here is instruction: https://intenso.atlassian.net/wiki/display/SPFJSD/Actions
I hope I've helped you.
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