Re: Call Girl Principle
That was, by far, my favorite episode of TNG. It's a shame Scotty didn't stick around on the Big E-D; not necessarily as a main cast member, but as someone you could occasionally see in Ten Forward, regaling people with tales of the old days.
You wouldn't even have to work at all to justify his presence on the Enterprise: he's an alumnus of the first two ships to bear the name! Besides, you can always call him a civilian expert on 100-year-old technology, and it's not as if running into Mirandas, D-7s, and other shit leftover from the Kirk years is rare.