@nowis: That sounds great!
Maybe you can also take a look at the module shbatm created. I don’t know what the status of the module is he developed but he wrote that it is up to 90% ready to use.
Although I have no clue about programming I think it should be possible to use the MMM-Swipe module in connection to the MMM-Pages from edward-shen. He also uses some kind of input (skywriter) to give commands to the pages module to switch pages.
But for daily use I would prefer the HCSR-04 sensors.