Not just ME, pretty much every market got the sub-tank option and other goodies that were not available for the North-American market.Why in the world would Lexus/Toyota not offer this secondary tank in the US? I think there was a similar deal with the 200s too, where they offered a secondary tank in the ME and not stateside.
For example euro-spec 200-series came with 18's or 20's and also the choice between KDSS or AHC/AVS from day 1.