Firstly, I want to say "thanks!" for wp-insert. I use the "Ad - Middle Of Post Content" feature to insert a MailChimp signup form in the middle of my posts. I know this may be overkill but wp-insert is the only plugin I've found that can insert code in the middle of a post without screwing the post up.
However, I've just noticed it inserting the form in my RSS feed, which I don't want since I also use MailChimp's RSS-to-email feature and the form doesn't work after all that mangling. You can see an example post here, and the same post in my RSS feed here.
I can't see any options to control insertion of ads into the RSS feed; How do I stop wp-insert inserting the form in my feed?