Hi Michal,
You can use the Live Fields feature of JJUPIN to restrict the options of the priority select list for anyone who is not an admin.
Another idea would be to use a validator and not allow people to create issues with a certain priority. However you have no control over the "Edit" action on the issue, so they can create the issue and then change the priority. Using Live Fields, the Priority dropdown will be filtered out on any screen (unless you specify otherwise).
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