I wasn't satisfied with the mod's answer since pretty much every time I've ever needed to use a web console like this, I've needed at the very least paste.

So here's a paste function you can throw into the console. To use:

1. Open developer tools
2. Paste this code in and hit enter
3. sendString('wow, i cannot believe this fundamental functionality is still nonexistent')

You might need to play with the sendDelay (increase) if you're having problems, but I was able to use this to add an authorized key.

To abort the sending of the current string, do sendString()

var sendString = (function(rfb, force, sendDelay) { 
  sendDelay = sendDelay || 25;
  var _q = [];
  var _qStart = function() {
    var chr = _q.shift();
    if (chr) {
      rfb.sendKey(chr);
      setTimeout(_qStart, sendDelay);
    }
  };
  var _qStop = function() { _q.length = 0; };
  var fn = function sendString(str) {
    _qStop();
    str = str || '';
    var chr;
    for (var i=0; i < str.length; i++) {
      chr = str[i].charCodeAt();
      _q.push(chr);
    }
    _qStart();
  };
  if (rfb.sendString && true !== force) {
    console.warn('rfb.sendString not installed because it already exists.  Use force if you\'d like');
  }
  else {
    rfb.sendString = fn;
  }
  return fn;
})(rfb);

There also seems to be copy/paste functionality in the code (disabled?).

If for some reason you're at some moment unable to ssh, and you need to paste in a large chunk of text, you can paste your text into a pastebin.com. Your text will be pasted to something like pastebin.com/xxx. You can then type at the console:

curl pastebin.com/raw.php?i=xxx

Ridiculous.

Reading into how to deploy a Ruby on Rails app and I'm instructed to type "gpg --keyserver hkp://keys.gnupg.net --recv-keys 409B6B1796C275462A1703113804BB82D39DC0E3" into the console.

Great solution!

However, I am not able to place a '@' sign either in a normal way or by using your method. Using sendString, a '@' is transformed to a '2' :(

Any ideas?

To add your SSH key via copy & paste from your local terminal to your console - to establish the SSH connection - as explained. You need to copy the console window URL (at the top of the pop up browser frame) then add this URL to a new tab in your chrome browser - then in your chrome browser go to View>Developer>Developer Tools>Console & enter this minimised script (below) - which will enable you to PASTE your copied SSH key into the console no problems. As per answer on github https://gist.github.com/croepha/7b53f211ae4be3c526c3

!function(){function t(){function n(t,e){s=s.concat(RFB.messages.keyEvent(t,e))}var o=e.shift(),s=[],i=o.charCodeAt(),c=-1!=='!@#$%^&*()+{}:"<>?~|'.indexOf(o),r=XKShiftL;c&&n(r,1),n(i,1),n(i,0),c&&n(r,0),rfb.sock.send(s),e.length>0&&setTimeout(t,10)}var e=prompt("Enter text to be sent to console, (This wont send the enter keystroke)").split("");t()}();