I would advise a person to find a partner around their own time zone and are usually on when they are on. The last one we had, there's always one person who couldn't show up on time (an hour late or two) maybe because one was in the USA and the other one in the Philippines. (They had only 2 hours to go on at the same tme).
So it would limit the "argh" can't get four people on at the same time. Right right? =D
But nonetheless, the randomizer for those who can't find a partner.
That's my "three cents."