The ability to manually change the conversation channel

It would be great if you could manually change the conversation channel so that it was easier to switch between email/ web or select the email/ web channel manually from phone conversations to be able to follow up or respond to customers that have called using their preferred method of communication. (This would also allow all workflows to run without adding a new feature: add phone as a channel to all workflow triggers)

Use case: Customer calls in > follow up is required > Agent asks customer what their preferred follow up method of communication is > Customer says email > Agent can explicitly select the email communication method from the composer or somewhere on the conversation itself > this would change the conversation channel on the spot to email > Agent can then email the customer on the same conversation > Everything is clear that the conversation channel is now email > Email workflows run.