JIRA allows you to put conditions on workflows where only certain project roles (better overall solution) or groups can execute the workflow. You can't exclude someone. So to do this you put a condition that project role 'staff' can execute the transition and on the specific ones put a condition that only project role 'special' can execute it. You can also include 'staff' on that transition if that is your model.
Limiting them to create only some issues isn't as easy. there are a couple work-arounds. JIRA doesn't allow you to do that out of the box. I suggest searching the forum for limiting issue type creation.
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