We have [magic](https://worldbuilding.stackexchange.com/questions/tagged/magic "show questions tagged 'magic'") which is well used, and Handwavium is basically a technology/physics equivalent...

We have many questions that involve this physics-bending stuff, so I think there's a market for it. It would also be a handy way for questioner to indicate that Handwavium can firm part of an acceptable answer.