Some things to consider before you disable a smog pump. Most state emission inspections check that certain emissions components, including the smog pump, haven't been tampered with. If the inspector knows what he's doing, he will be looking for missing belts, plumbing or wiring related to the smog pump.
If you disable the smog pumps drive clutch or belt, and the pump is still connected to the emissions plumbing, trace amounts of fumes or moisture will get into the pump causing it to seize. Chances are, if the pump drive is disconnected, by the time you reconnect it for emissions testing, the pump will be locked up.
(Although, you could wait until the engine is warmed up before plugging in the wire connector, if at that time the pump isn't engaged anyway. The belt and pulley would still turn even if the pump was locked.)
Happy Motoring, Mark