So, I really like the time delay, has saved me a number of times, BUT it's also kind of a waste of a feature when you can't keep typing the next message or approve/send the message ahead of time.

What I would like to see...one or both:
+Delayed message pops into the body, where a user can continue to type next message.
+Option to press the message to instantly send it (i.e. you've reviewed, it looks good, click, and send).

This allows someone to have normal conversations without having to wait however many seconds in between every message. Otherwise...why not just make the habit of checking the message before sending?