Wouldn't it be awesome if you could generate an e-mail draft using the Missive API that doesn't contain just the right addressee, subject, a suggestion for a body text and has the right label applied, *but also the right files already attached to it*?

I'd love to see that last option added. Right now I've built a script that can send an email with freshly generated files (quotes or invoices) attached, but now I (obviously!) get asked for Missive-features ("Can you add links?", "I'd really like to be able to Send Later, just like in Missive." - You spoiled them! :D). I shouldn't be trying to built the Missive e-mail editor all over again. You did a way better job than I ever will! Let me use yours. :)