@Bazza I completely agree and do want this feature, but I won't be holding my breath. Even if we manage to pressure them into enabling it, chances are they'd only do so on new model and leave us existing owners out. They introduced lane guidance in the 2012 IS but did not make it available it in the 2011 IS (same shape, same hardware, same everything)
Mind you, my 2011 IS doesn't even have speed camera and red light camera warnings, most portable satnavs have had this feature since the early 2000s.