Motor direction can't be programmed, switching 2 of the 3 wires is the correct way to solve the problem.
RC-Expert are ok but some of their parts in the packages are not good, they gave me Esky servos with mine which might work in a hover but not much more as they are 0,4 kgs/cm compared to Align's taht are 1 kg/cm, that is 40% of what the manufacturer think is sufficient...
The Telebee gyro I got I changed rather quickly, HH was not possible to get working properly, Now I'm flying Futubas in both Rex'es
The batteries I got was pure crap, the weakest one I completely toasted on 3rd time trying to hover if I remember right, the other one I couldn't even get a liftoff with, they supply better cells now even if they told me mine should be ok, obviously they have come to the conclusion I was right....

Conclusion, because of their comments when I gave them feedback on the servos and batteries I'm not buying from them again, however if you know what you want and what you are getting it's no problem but frankly I wouldn't touch one of their package deals again as they put in cheap stuff you'll want to change later so it's a complete waste. Throw in a few bucks more and buy qualitystuff right away. At least get Align stuff and a good gyro.