syndication
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You can add settings for RSS syndication but not use them
There's an action syn_after_site_form
which enables form fields to be added to the configuration screen for an individual feed.
You can intercept, validate, sanitise, and save the settings into post meta on the feed post during the save_post
hook.
There is a filter,syn_rss_pull_filter_post
, provided to "exclude or alter posts during a pull import", but this filter is not passed the ID of the post where the site data is saved, so you cannot access the additional post meta at this point.