An extra software that people can pay for that PlayIt can send a http (or similar) request to which in turn would fire off a set amount of carts to whichever audio output the user defines.
Playit is already capable of this using third party software and a bit of coding, but to have it as an extra 'bolt on' would be big. (I'd pay for it!)
Comment on this feature request:
Darcy Roulston commented
yes love this! to have each station have own ads and sweepers etc.