I'm wanting to book J MNL HKG YVR JFK with a stopover in YVR for 2 nights, then return JFK HKG MNL, not necessary, can be JFK YVR HKG MNL, just no need for the stopover on the return. Is this possible and if so how do I book this? Rules say stopover is possible if you book CX888 or CX889. How many days are allowed on a stop over?

Also,considering booking just MNL HKG YVR. Then book J using Asia Miles for YVR JFK, when I go to book for just one ticket, there is availability, but if I select 2 tickets it only offers "try waitlist?" Would it be better to book 2 sepearate tickets, one through my Asia miles account and one through my wife's? How risky is relying on waitlisting?