I think more useful would be the ability to also send small, twitter-sized messages instead of just transactions via darksend. Imagine that you could combine a transaction with a message or something like that. Hash the characters together and send it like a transaction, and all of a sudden, you have a really well encrypted, anonymous message system that overlays on an existing network.
This compromises anonymity (unless the message is utterly generic, in which case there's no reason to send it). You could argue that it's one person voluntarily compromising his/her own anonymity but because of the way DarkSend works, they're chipping away at the anonymity of everyone else involved in the mixing.
I don't think it would have to compromise anonymity. Unless you mean that the sender and receiver would not know each other - in which case, that might be true. However, if you are sending a coin transaction, you presumably have some idea who is on in other end.
What I mean is that a short message (eduffield would have to address a proper length) would be broken down just like a transaction, and sent like a transaction. After all, data is just data. There would be a reassembling and decoding at the other end. You are already processing cryptographic codes - why not use some of that hashing for encrypting a message?
It seems to me that an addition like that would allow you to further obfuscate the transactions because some of what is sent is no longer a "transaction" it is a message that is treated like a transaction.
The more traffic you have, the harder it is to follow the red car.
I like this idea. I've no idea if it would work but it seems the more layers you add to it, the harder it is to crack. If the key is to differentiate the coin and create widespread adoption for overall success, this feature certainly could be an interesting prospect. That is if it can be pulled off.