Dude its true-I recently confirmed this with my local bimmer tech. I got this from the 7 series board initially which led me to the 5 series board all of which like a 100 people did this and so did I and it works like a charm.
Go out a try it.
There are lots of things bmw doesnt want you to know-you find all the hidden menus by holding down your odo reset? Like digital speed and tach read outs, engine temp read out and lots of other goodies? I bet now-thats cause they dont tell us any of the cool stuff!!