Here in the UK we have to 6 foot rule to prevent exactly this kind of horrible accident occurring,
Which is almost universally ignored by ground personnel. Good point about the stop button, it never occured to me that it should be manned when you are taxing on to a stand but it makes sense. I have never seen anybody standing beside one in all the years I've been driving aircraft on to stands. One frequently sees (in parking guidance mirrors) ground crew walking right in front of the wheels trying to put chocks in before you have even shut down. Perhaps people will be a little more careful for while now, shame it takes an awfull injury to do it though, very sad.