Actually the best rtw's are not called rtw's but are "over both ponds" routings. Flying to a destination with stopovers and returning by going on the same direction. ex: US to India over Atlantic, return India to US over Pacific with many segments and stopovers.

There's a current story on pointsguy.com about this entitled "Using US Air Miles to Book International Star Alliance Trips" He also has several other stories on using other US airlines the same way.