Hi! Yes, definitely possible! Actually, if you go to the basemaps tab in the right side, you can find some specialised basemaps, for example Thunderforest / Transport has a great visual style for train and metro lines.

Now, talking about integrating it into MapHub rendered maps, it's definitely possible. I am using the open source osm2vectortiles [1] project, and the older, open source MapBox tm2 styles [2] to render the tiles, so changes can even be contributed by the community!

[1] https://github.com/osm2vectortiles/osm2vectortiles [2] https://github.com/mapbox/mapbox-studio-osm-bright.tm2