I want to press M-j and have readline place my cursor on the next line without entering a command. Thus I should be able to go back a character onto the prev. line. This answer states that it cannot be done. I think it's wrong.
You can kill the newline character, and yank it. This achieves what I want to do. However I just can't create the binding.
To test this out type:
Now you should be on a newline, type C-y. It does what I want! But what character is this? What binding works in an inputrc file?
EDIT: It turns out the character is a line-feed. Still not sure how to bind it.