This android app was mentioned in
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There's an app from Charmin you can grab for your phone called SitOoSquat that lists public restrooms available around you with hours of operation.
It is; SitOrSquat
It just didn't take off to get into the mass populace. The difference in my app would start as more oriented toward women, since women are more inclined to sit and have to be around used hygiene products left out. Proof being in the ask reddit threads about restrooms, there seems to be a unanimous "women's bathrooms are filthy, shit on the walls, bloody tampons, pee everywhere, etc." So I'm sure my gal pals will certainly use the app and spread it around by word of mouth.
Check out SitorSquat, doesn't answer all your needs but has a good bit of info.
Linkme: Sit or Squat
Hm, linkme got it wrong. Here's the link [link]