I would use to set up a Sticky Post (which acts as an Intro to the category) but does not appear on the frontpage.
Currently, I achieve this with an additional event plugin that looks for posts which are Draft and Sticky - these will not be be shown normally in either location ('cos they are Draft) but my plugin will display the contents where it's needed.
There's nothing wrong with this approach but it's a bit contrived and it should be very simple to add the option in Additional Options.
(Before you ask - Yes - I could do it myself but, so far, I have managed to get S9Y to do 90%+ of what I want WITHOUT altering core code)