Crown hand shuffling is quite rare, unless you're in the Mahogany room, however, it does happen if an ASM breaks own. I'm not quite familiar with shuffling terms, given I don't engage in any AP maneuvers with respect to shuffling, but I have seen the manual shuffle several times.
The dealer will break the deck into two four deck piles, and place them side by side. They will then pick around half to 3/4 of a deck from either side, then riffle them together and place them in front. After doing this, they will repeat this process. This, I gather, is what is meant by two passes? On the second pass they will interweave the decks only 50% to show the pit and surveillance that a shuffle has actually occurred, and that they haven't merely presented the 8 deck pile unshuffled.