Feature Request: Cancellation Explanation

Consider this:

What if when you clicked "Reject" on a slime battle challenge, you would be taken to a screen where you could enter an optional one-line explanation before confirming your cancellation. It would give people the chance to say why they are rejecting a battle. Stuff like:

* Nah, not in the mood.
* Sorry, I'm gonna be gone for two weeks
* Hell No! That isn't fair!
* Too unbalanced. Give me Slimebot Custom next time?
* Can't risk breaking my winning streak
* Your challenge is beneath me, puny mortal
* What the heck is this slime battle thing?
* Not without a longer turn length. I don't wanna get suckerpunched!

Then the rejection reason (if any) could appear in the list of canceled battles next to the battle title/name.

This is entirely reasonable. I'll include it in my list of things to do to the battle acceptance flow.

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Mega Tact v1.1
Super Penguin Chef
Wizard Blocks

The thing about this feature that is most exciting to me is the possibility of it being used as a way of communicating what conditions need to be met before somebody will accept a challenge. Right now, canceled challenges usually just die, and I am left unsure whether or not to re-challenge. It would be great if people could say "give me more allies" or "give me more time" or "let's agree on a handicap"