Try typing just "/r" without any message. That should initiate the chat, then you simply type normally. It's if you type "/r [message]" that it only does the message.
Somehow /eat sounds like "Hold an item in your hand and type /eat to immediately eat it without animation and delay".
Thank you for the additions, I've added them to the list. Just so you know, this is just command shortcuts, rather than useful commands.
