Overall, I don't have a strong preference, I just think we should be consistent either way, at the very least locally (per OSM principles) if not nationally or with OSM as a whole. Perhaps the #local-nrv channel in the OSMUS Slack, where several of the other most active NRV mappers hang out, might be a good venue to decide on this?

Just for reference, worldwide less than 20% of roundabouts have oneway= https://taginfo.openstreetmap.org/tags/junction%3Droundabout#combinations . On the other hand, in the US https://taginfo.geofabrik.de/north-america:us/tags/junction=roundabout#combinations and Virginia https://taginfo.geofabrik.de/north-america:us:virginia/tags/junction=roundabout#combinations that rises to over 50% (perhaps because of the lower familiarity and less consistent usage of roundabouts versus circulars and other types of junctions here versus in Europe and elsewhere, thus greater perceived need for explicit clarification).
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            Published using OSMCha: https://osmcha.org/changesets/173250739
            