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1) Hello... the expert that you requested is not logged into the JA website. However, I will be happy to assist you with your electrical question.
2) From an electrical operational viewpoint, it does not matter if the disposal is directly hard-wired from the unit to the wall switch or from a switched plug-in receptacle. Both methods will operate the same way.
3) The only trade off with using a plug-in receptacle is that if you ever had to replace the disposal in the future and you purchased another disposal with a cord, then all you have to do is plug the cord into the switched receptacle outlet. Hard-wiring some disposals can be tedious since the manufacturers barely provide enough room inside the unit to make the wire splice connections.
4) If wanting to install a wall receptacle, you would need to extend the switched hot, neutral & ground wires into a wall receptacle box. If the receptacle will be installed within 6 feet of the sink, it needs to be GFCI protected.
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