Filters stars related to routes

[ljramones]

From Chuck's comment on the FB group

" I have held off going back again, but I have a question about displaying routes ALONE.
Specifically, can the user hide all stars except those on routes? (And if so, are the routes in-display chosen individually or defaults to one or all?)
If that doesn't exist, how difficult would that be to create as a feature?
I found this very handy when trying to get a quick sense of rival route overlaps. (e.g.; likely disputed crossroads systems)"