I can certainly add a femboy option in the personality update, no problem. :)
It's not currently possible to have more than one wife, or to have more than one girl living with you, but I am thinking about doing something along those lines in the Jobs & Home update (at least for the latter).
I'll think about the day cycle change. It'll probably be really tricky to add and break a load of stuff, unfortunately! But it could happen. The game has become much more complex than I originally intended, so the original three-timeslot day cycle may become obsolete in the future.
Mobility scooters will definitely be added. Probably part of the Jobs & Home update.
Interesting idea with the stomach capacity thing! I would like to do more with weight loss at some point.