Someone should do something like this smart knob[0]. It looks incredible.
Re: multi-functional sliders, I do know that motorized sliders exist in the pro audio space (e.g. to be able to program presets on mixers and such); shouldn't be too hard to adapt them to multiple functions (probably with some sort of indicator on or adjacent to the slider to show the function being manipulated).
But for the purposes of this discussion, having a couple three of those on the dashboard and using them a bit like radial menus would probably split the difference pretty well.
I thought I saw it most recently on The Expanse, but it does not appear to be part of the MCRN Frigate pilot's seat. So either I'm thinking of some other ship, or a different bridge.