i have somewhat of a dev mind i can say that disabilities would be kinda sad and brutal as this game is meant to be CUTE, cat towers would be nice and i can imagine it coming, but it might not happen, catnip would be a AMAZING feature for cat games like this, shelfs obviously would be again, perfect, but honestly i would just sell the food if i couldnt use it at the moment.
TBH I think that there being a chance they are amputees wouldn't be too sad or brutal. But It would be hard to implement since the developer would have to draw four more cats for each cat coat that already exists one for each possible missing leg.
And don't get me started on cats with missing eyes or ears!