The motion light is an excellent idea. We have tap-a-lights next to the bed, and keep the living area and bathroom lights on... dimmed, all night.
As to the walk-in closet... perhaps not necessarily required, but ours is quite large, and wheelchair accessible. The requirements for wheelchairs to turn around, is a 5 ft. circle. Also, though we haven't installed them, there are hydraulic closet rods available which drop down for wheelchair accessibility
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Another possibility for wheelchair access, is an under the bathroom "counter" open area to allow getting closer to the sink and flexible hose shower heads are a must.
I didn't mention raised toilets, or the many grab bars in the bath, or by the bed, which can also be helpful.
General recommendations for handicap areas include solid floors... tile or hardwood, but we don't agree with this. Our carpeting is high quality low pile, with firm cushions that make wheelchair movement easy, while providing warmth and protection against slipping.
Since we live in a regular home in a CCRC community, we get a chance to see how others adapt to disabilities... some quite creative, such as permanent floor mounted railings for movement between rooms, and lowered tables... wheelchair level. Anything that can help avoid bending over or help in getting up from a bed or any seated position makes for more comfort for the disabled.
Another simple item that we use is a two way intercom type baby monitor. With vaulted ceilings, and carpeting, sound doesn't travel well, and this helps.
All of this may seem to be overkill, and not on the wish list for younger people, but for those who expect to live in the home over the long haul, it may make sense to plan ahead when building new, or remodeling.
