r4ndom is working on the bencode() function right now. I wrote a small code to dump a torrent's content to stdout, but it's not really useful. For such tools, I don't think it's a good idea to include them in the repo, as we'll end up with many tools for no practical reason. I prefer keeping them outside the tree until the lib is feature complete.

As for the prefixes, I settled on simply 'b' for bencoding related function. And no, a list of prefixes in comment shouldn't be needed as it should be obvious when reading existing code. That's also why the first patches someone submits should be reviewed by existing contributors