I think Roon already does all of this…
Start by picking “Focus” at the top of the album or track browser:
Then scroll all the way to the right on the focus popup and lok for “Format” and “Inspector”:
The format popup:
Under “Inspector -> Storage Locations” you do the per-folder filtering:
If you come up with some focuses that you use frequently, you can bookmark them to save you the trouble of setting them up each time:
If you just want to see your genres and not have ours superimposed, set up your browsing preferences like this:
Note that these browsing settings are per-control-point. We may re-think this in the future, but for now, if you use multiple control points, you’ll need to set it up for each of them separately.
btw, are you the Zoltan Varga from mono/xamarin/msft?