[sdiy] Momentum in front panel controls?

[cheater cheater]

I was wondering if anyone had seen sliders or knobs that had momentum.
I think it could feel nice to work with something like that, and it
could also let you eg propel a slider to make a slow fade happen while
you're also doing other things at the same time. This video about
flywheels made me think about it:
https://www.youtube.com/watch?v=TrNEkbdXEuw