I tried some creative routings starting in Europe. What i found is: No problem having multiple flights between Europe and Asia.

What you need is exaclty ONE transatlantic, ONE transpacific flight. I also had problems going west from the starting point and then east of the starting point.

As long as you stay west of the starting point and dont 'overshoot' at the end it should be ok.

Also i found that there are some 'general' rules for any kind of tickets, like the number of times you are allowed to go thru one connectiong point etc, which are not part of the RTW rules, but still in effect.
This is the reason why you cannot just go back and forth between LAX and SNA several times.

I have an excellent travel agent for RTWs here in Germany, he is even able to get RTWs staring outside of Germany for the fare in the country of the starting point.