Can you hide certain catagories from the requestor

Can you hide certain catagories from the requestor

We have a catagory and subcatagories used for internal IT use only for system maintenance etc.  We have named the catagory DO NOT USE, yes users continue to pick this catagory.  We have no routing rules or auto assignments on this catagory and thus tickets sit in there and SLA unless someone is constantly checking unassigned tickets (as most others get assigned to a group, etc)
 
Is there any way posible that exists today, or an enhancement that we can hide catagories from the requesters that we wish to use only internally or hide cataogories depending on request template used?
 
Thank you

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