well, there could be a test run with players from only one timezone (e.g. europe).
The much harder problem is determinating seating order. For everybody to have a fair chance they should sit in position 1,2,3 equally often. That means rounds have to be a multiple of 3.
and the way goko handles seating right now, there will be a plethora of restarts before the correct seating order is achieved. Any thoughts on how to solve this?