I'd like to have walkers, wheel chairs, and canes that you can purchase for anyone who can walk and not just elders. Prosthetics could probably be implemented as an accessory or under body details. Bionic limbs and body parts could also be used in futuristic gameplay and not necessarily as a disability. It'd be nice to have aesthetic options so that people can use them and roleplay however they want. I don't want a full-blown disabilities system or mental illness though. I'm not sure how that would even work in a tasteful manner since, as others have stated, not everyone affected by something has the same symptoms and some things aren't even visible.
