I'm playing the Group Home in Emerald Heights, and having eight Sims and only two bathrooms is driving me a little nuts. I'd rather not eliminate bathroom privacy entirely, though. Is there some sort of sign or something that I can put up that tells the Sims to ignore the privacy issues for that room/lot only?

There is Pescado's Bathroom Uses You which kind of works in the opposite direction from what you want. What I find useful about it is that it lets only one person in a bathroom at a time and kicks them out when they're done, allowing the next one in promptly and efficiently. It also, if you allow it to work automatically (and not interfere as I do), will get sims who need to go to queue up and will call them into the bathroom when the room is free.

I forgot about that! I'll try it and see how that works.