I've done it. It was a long time ago, back in the Eighties. I was running a scenario based on an investigation into some shenanigans down at Dover docks. Customs officials were involved, and police and Interpol agents from across the Channel, and the player characters were caught up in the mix. It ran kind of like an action thriller, with Hitchcockian overtones.
A more recent adventure I sent off to S & P as an exemplar had the characters stranded on a TL 7 world. Amid the chaos and mayhem that was happening there (some trouble at an archaeological dig), the technology was pure TL 7: no mobile phones, walkie talkies the size of house bricks, television and the press were the Internet of the day, along with radio and a fledgling Teletext, and the only concession to more modern tech was an imported retrotech TL 9 computer designed by a TL 11 and flogged to one of the natives, allowing him to hook into the nascent internet that was only forming there.
The characters would have had to get used to cars that ran along the road under manual control, supported on doughnut-shaped pressurised balloons of Vulcanised latex rubber. But the feel of the tech was contemporary with the era in question.
Even back then, I could see the potential for Cold War-era tales and 30s noir adventure, as well as the usual space opera hijinks we get up to.
