With only three destinations the cost per flight for an RTW is pretty high. The tickets allow up to 16 flights, so with only four or five (as you'd need) the breakeven point with conventional tickets might not be surpassed.

I'd lurk on the "Premium Fare Deals" board - http://www.flyertalk.com/forum/premium-fare-deals-740/ - to look for deals to California, Japan and/or Hawaii out of Europe. I think it's entirely possible you could put a good itinerary together without jumping through the hoops of what would be a minimal RTW itinerary.

Now if you want to expand your range of destinations and utilize the RTW more efficiently, you've come to the right place.