Never been asked to do 180 til 4 anywhere in Mr Boeings finest product - it would definately result in a polished shoes, hat on chat with the fleet manager!! 160 is the norm, technique is to get the flaps out and drop the gear at 4.5 miles which just about gets the speed below the flap limiting speed for land flap. Auto approaches have their uses but the vast majority in my firm are manual, especially in Greece!!
I believe that some of the turbo-props can fly a faster approach and use their aerodynamic drag to be configured nicely in time to land.
I teach 100kts to MDA for IMCs in a PA28 as well, seems to make things easier all round