I’m having a similar problem. I want to customize my WordPress RSS feed so that if the post contains a custom field, the name of the custom field and its value appears in the feed for that post.
To give a specific example, some of my posts will have the custom field, “Rednote”, and its value could either be “Date Corrected” or “Newly Added”. I would like the RSS feed to display <Rednote>Newly Added</Rednote> OR <customfield>Rednote: Newly Added</customfield> for that post.
It doesn’t look like any plugin exists to do exactly that. I have PHP experience, so I’m not afraid to dive in and modify some configuration files. I just need to be pointed in the right direction in terms of files I should be looking at and strategies I should be considering.
Thanks for your help.