enable requesters to change the status of Priority field on a submitted request

enable requesters to change the status of Priority field on a submitted request

Hi, I have not been able to figure out a way to enable requestors to modify the status of the Priority field after they have submitted a request.  There are times when a user submits a request and the issue is simply a Priority 3 and then for some reason it becomes more urgent and they would like immediate assistance.   I have business rules defined that automatically send alerts when support requests have been sitting in queue for a specific period of time and not assigned and it would be helpful if the requestor could modify the status of the priority which would trigger the business rules to take affect based on the new priority.
 
I am currently running SDP 7611 with a MS SQL 2005 SP3 database.
 
Any suggestions on how to accomplish this or is it simply not an option?
 
Thanks, 

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