Is there any way to work around tapping done after speech to text?

It's a good question, although no matter what you will have to touch the screen after dictating to send the email, so you're not exactly any less inconvenienced.

I do believe at some point Siri will be entirely buttonless; I.e. you speak a certain command to initiate Siri/dictation. The phone will of course always have to be actively listening.

 

I'm sorry, I did understand the question. But I don't know the answer so I was merely conversating out of boredom.

By the way, you're looking for a "command" to hault dictation recording. Might have luck searching for an answer using the term command. I would but I'm on my phone and too lazy.