Title suggests it all. The FAQ says:
"5. If you have a quote in your post, you can hit enter two times while your cursor is in the appropriate location, and the quote will be split there."
This is flatly untrue. Sometimes it works, oftentimes it doesn't. I'm trying to reply to a 5 point post, and 1 and 2 split as per the above statement, and the rest don't. With forum source as a thing, I could just throw formatting tags in, but instead I'm stuck with a series of annoying choices to try and make it look the way I want.
<EDIT> So I just went back to my window, and hit enter twice, and split them all. Could it possibly care about how quickly you hit enter? tap--tap works, but taptap, or tap-tap doesn't (where the - is some time interval)?