You can still do this.
From any app, select share, select email, delete the unwanted content from the app if any, compose and send your email as usual.
From the email composition screen, you can swipe up and over to get to the hub, where you can read other email Or even compose another email at the same time.
Swipe up, select the app and you're back in the compose view of your first email.
Extend this technique as need arises.
But I agree, it should be easier to do this directly in the hub.
Posted using CrackBerry App on BB10