"Send and archive conversation" and "Send and move conversation to folder" or "Send and apply label to conversation"
All the gestures, the GTD stuff, the labelling and moving always apply to inbox. We need to be able to decide what to do on the whole conversation once the mail we are typing is sent !!!
e.g. my email is the final answer so I want to archive the conversation directly after sending the mail.
Or I will need an answer to this email so I need to put a reminder on the conversation in two days, and I need the conversation to be labeled as Waiting For or moved to the "Pending" folder.
Well you get the idea.
This is a must have for GTD users and it does not exist on iOS.

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AR commented
I'd like how they do in Edison mail, once I reply I archive the thread. If there's. Response it'll come back.
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Anonymous commented
If you can create a way to select which account and which label within that account the conversation can be archived to at the point of sending then you will have my loyalty for life!