They also need to look into the design of the regular stalls. The reason I sometimes use the handicapped stall is that when I get into the regular stall, I have to straddle the toilet in order to close the door!
I especially love this design in airports and bus stations. Where I usually wait for the HC stall so I can take my suitcase in w/ me and not leave it sitting out to get stolen.
I do this a lot when I am traveling.
You aren't supposed to leave your luggage unattended BUT the stalls are too small to take the luggage in with you, unless you use the handicapped stall. At least in most airports (especially the larger ones), the baby change station is not in the handicapped stall too.