I guess if you were conducting a straight in Vis approach and ATC ( or terrain ) left you high then this info would be useful to recover back to profile. For a new Pilot on a type I'd suggest this isn't an ideal situation to be in until you do get to know the Aircraft.
I can see what he's after but I'd suggest he get used to the 738 in normal ops first.
It sounds like he understands jets, and just needs a piece of unpublished info. "I can do X in plane A, can I do X in plane B?" Yes. Problem solved.