Separate draft email composition feature

I would like to be able to compose emails as drafts, i.e. in the draft folder.

I have had a few slip-ups: composing and saving emails as drafts only to find that the body of the email has not been saved; and composing emails to be timed and send out later but have hit the "send" tab by mistake - 🤦‍♂️ I know but sometimes I am interrupted mid-composition and when I return to the email forget where I am in the process. 

Please would it be possible to add a "Compose and Email as draft" feature from the start of the process rather than making an option during the standard email option.