We didn't allow for re-opening a resolved catalog concern before, but with the introduction of the update status's I think we managed to change the logic a bit and the 'Update' button now displays. This effectively allows for re-opening a resolved ticket; However, the actual ticket state isn't properly updated and should be so the new state is properly reflected in the display table and filtering options.
+1 We would like to be able to reopen concerns if the resolved status is accidentally updated. Also the ability to clear any status or assignment so it shows as new and unassigned again would be great.