Ahhh..the wonderful gray areas of the FARs..If anything, I could see him being able to log it as Dual Given..but there's really no physical way he could command that aircraft being in the back seat in a given emergency where a PIC is needed most.

But again, if he's that desperate to build the multi-PIC, then whatever floats his boat. He just better hope an airline doesn't catch anything while going through his logbook..that would be one explaination I wouldn't want to give during an interview...