In the new outbound feeds RSS feed, the atom link can be updated via the channelPath custom field on the RSS feature.
However, this does not appear to handle cases where a resolver has been used to map a URL field to a specific value.
I think we could use a way to configure the channelPath to echo the entire RSS feed url.
For example, an author RSS feed of /arc/outboundfeeds/rss/author/shaughnessy/ should result in an <atom:link>https://site/arc/outboundfeeds/rss/author/shaughnessy/?outputType=xml</atom:link>
Not <atom:link>https://site/arc/outboundfeeds/rss/</atom:link>
Thank you for your idea! We will include this functionality in our upcoming release.