[yodameister]

I know you were looking for past/present refs for an answer, I am moved to chime in here. I would have absolutely no issues with a small step stool for your driver (if dwarfism is present). My spouse is quite short (4'6") and I completely understand the difficulties for those who are not of average height. And while she is not considered disabled, she is handicapped in what she can do without assistance devices.