Not that I've seen. There's a complicating issue, too — one message potentially makes multiple new actions. Every line that starts with "--" will carve off a new action. Which action(s) would get the attachments(s)?
I agree that often you just want to get the whole email, attachments and all, into OmniFocus, but you're using the avenue intended for creating new actions via email, and there isn't any way to tell OmniFocus that messages to a given address should only get some of the usual processing. Most unfortunate when the "usual processing" does the wrong thing with your messages, and you can't change the sender's behavior!
As always, if there's something you'd like to see changed, use Help->Send Feedback to make your wishes known.