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the benifit of getting an MEI is that BOTH pilots can log PIC as long as the other pilot agrees to accept dual.
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Or you can fly as a safety pilot and log PIC/SIC depending on who's acting as the acting PIC. You don't need an MEI to log PIC in a twin or any instructor rating to log PIC in any aircraft (with two pilots). If I were an HR guy I'd be more leary of someone who has a ton of ME dual with one or two people than I would with someone who has flown as safety pilot. That's just me though.
If you already had your CFI/I you'd already have commercial - you'd need to do a multi IA privledge ride, and a multi-comm add on but those aren't really full blown checkrides. CFII can be used in a multi if you already have ME privleges - there isn't a seperate ME-CFII.
In other words say you have a private multi add on, and you do your commercial in a multi you then get a CFII rating you could give instruction in a ME but not a SE because you don't hold a single engine commercial. Confooosing aint it?
