What would you want in a ABDL game?

I've been playing some of the freeware ABDL games out there lately and based off them I've got a lot of things I'd like from them.

Want:
-Physical and mental age stats
Main character starting at a certain age and can either mentally regress, physically regress, or both. As in an adult retaining their mental age but growing down and having to deal with being treated as a child, retaining their physical age but mentally turning a child, or both and just that stuff happening.
-ABDL stat
How much a character actually enjoys being put into ab stuff.
-gender
Want to wear a dress as a guy but don't want to suddenly have a sex change? I wouldn't mind that
-sibling dynamic
How you are treated changes based off age of course, you don't want anything to do with a little bro at one age, to being best friends, to the point where they don't want to deal with you.

What I don't want:
-a timer before you have to go to the bathroom
Would rather have events appear that determine if you will have to use the restroom or not than a timer.

I'll add more later, but what do you want?

What would you want in a ABDL game?