maplint not-in-map_features

The guideline for mini roundabout in Australia say add “direction=clockwise” but maplint reports not-in-map_features.
Can this be ignored?

Yoda…

Maplint complains for all tags that it doesn’t know of, even tags that are in the map_features page perhaps. It doesn’t mean anything other than that: it doesn’t know of that tag. If you think that tag has a valid meaning than there is no reason to remove or not adding that tag.