Thanks for the replies, guys. He's not an MEI that I know of, but yes it is a two pilot aircraft so my being there was basically a formality. I ended up logging it just as multi/complex time (I don't have room for a turbine column and as I'm starting a job as a CFI I'm not willing to give up the Complex column yet), and I'll leave it off the resume to keep from getting interrogated on Jetstream hydraulics my first regional interview.

Again: thanks for the advice.