This is what i did to get the ace editor working with sharejs @0.7

gistfile1.js

/*
Most stuff up here seemed to need no change the orginal unmodified may be found here:
https://github.com/share/ShareJS/blob/0.6/webclient/ace.js
ideally you should be able to use it thus:
sjs = new window.sharejs.Connection(sock);

var doc = sjs.get('users', 'blah ' + Math.random());
doc.attach_ace(editor); // editor here here is  some ace editor object i.e:  var editor = ace.edit("editor");

###############
// i'v deleted content of stuff i did not change to keep this short, so do not delete!
###############
.
.
.
*/
sharejs.Doc.prototype['attach_ace'] =  function(editor, keepEditorContents) {
    var check, deleteListener, doc, docListener, editorDoc, editorListener, insertListener, offsetToPos, refreshListener, replaceTokenizer, suppress;

    if (!this.provides['text']) {}
    var doc =  this.createContext()  ; // @ changed
    var editorDoc = editor.getSession().getDocument();
    editorDoc.setNewLineMode('unix');
    check = function() {
      return window.setTimeout(function() {
        var editorText, otText;

        editorText = editorDoc.getValue();
        otText = doc.get();                // @  changed
        if (editorText.length !=0  && typeof otText != 'undefined' && editorText !==otText ) { //@ changed
          console.error("Text does not match!");
          console.error("editor: " + editorText);
          return console.error("ot:     " + otText);
        }
      }, 0);
    };
    if (keepEditorContents) {
      doc.del(0, doc.get().length);  // @  changed
      doc.insert(0, editorDoc.getValue());
    } else {
      editorDoc.setValue(doc.get()); // @ changed
    }
    check();
    suppress = false;
    editorListener = function(change) {}; // i'v deleted content of stuff i did not change to keep this short, so do not delete!
    replaceTokenizer = function() {}; // i'v deleted content of stuff i did not change to keep this short, so do not delete!
    if (doc.getAttributes != null) {
      replaceTokenizer();
    }
    editorDoc.on('change', editorListener);
    docListener = function(op) {}; // i'v deleted content of functions i did not change to keep this short, so do not delete!
    offsetToPos = function(offset) {};// i'v deleted content of functions i did not change to keep this short, so do not delete!
    doc.onInsert   = function(pos, text) {}; 
    doc.onRemove = function(pos, text_len) {};
    doc.onRefresh = function(startoffset, length) {};
    doc.detach_ace = function() {
      editorDoc.removeListener('change', editorListener);
    }; // @ you may need to fix this funtion, i ignored it (coomented out all the removelisteners except the one left)
  };