In order to better capture a clients engagment it would be useful to be able to have more options available in the Filter Type - Marketing emails.
I am proposing to add an "any" marketing email (with the same options once selected) and the ability to "select multiple" marketing emails.
Currently you can select a "single" marketing email. That makes triggers more complex and difficult in workflows/lists then they need to be especially if there are lots of marketing emails.