dual motors also allows you to do a series/parallel mode, where you can apply all the current in series to the motors for more torque then switch the motor configuration to parallel for more top speed, *sorta* like a two speed transmission, with switches instead of gears.
i.e.
http://www.4qd.co.uk/faq/bmnc2.html#diff
http://www.diyelectriccar.com/forums...lel-16415.html
but there may be an assumption about a current limiting controller or something.