I haven't done any cold crashing outside of just letting the keg sit in the fridge for a couple of days before taking a pint. I'm pretty careful though when transferring, from pot to fermenter, then fermenter to keg to leave as much sediment behind as possible. I usually shoot for 5.5 gallons to fermenter, then get about 5 into the keg when all is said and done. The last two beers I've kegged, after the first couple of pints, , ended up as clear as any comparable commercial beer I've ever seen.
So, I guess to answer your question, no, I see no added benefit to cold crashing before kegging. Just be careful on your transfer from Primary to keg and my experience says there really is no benefit to cold crashing before kegging.