First off, Bidets are the best. Dry paper is just such a crude way to clean!
But it can be awkward to get a Bidet jet to line up properly for the best clean. My build idea for the show is to make some kind of device that automatically aims the cleaning water stream. My guess is that it would need some kind of low light camera, perhaps an Infrared sensitive one with a few LEDs. This could then use some kind of software to aim the water stream at the right place.
I know this might seem like a bit of a silly idea, but for elderly or people with restricted movement it could make life quite a bit easier.