It would be nice to have the unused knobs and jacks greyed out on the display, simple as that 
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What led me to this feature request was that the module was acting a bit weird. I’d made a patch here:
when I first made it and loaded it up on the module, all the knobs seemed to work but none of the knobs on the display animated. I don’t know if I was doing something wrong but I scrapped the patch and then remade the patch by doing one knob-set at a time. This now works but it took longer than it should have.
I also noted that some of the ins and outs needed to be manually patched using the module, even though I had already patched them in VCV. 
Are you talking about grey-ing out the knobs that aren’t mapped on the modules when looking at the whole patch? Or when looking at a module?
Or are you talking about grey-ing out the knobs when looking at the Knob Set (the twelve arcs of knobs)? On that page, unmapped knobs have no text underneath them.
I see on the patch you attached that the first Knob Set has no mappings at all (it’s called Macros). Based on the date of your post, it’s possible you experienced a knob set bug in one of the early versions of the VCV plugin, so that might have cleared some of your mappings.