Hi,

The feature that you mention could possibly come in a future release.  It was cut from 9.1 due to lack of time.  If you would like this added sooner rather than later, submit a feature request and let our PM know so that the control will better suit you.

Fortunately though, it should be possible to accomplish what you desire.  What you will need to do is handle the NodeChecking client event.  You will then cancel that event and set the checked states of whatever nodes you want.  The following handler will allow the tree to simply have a checkbox switch between checked and unchecked when clicked without autochecking any other nodes.

function nodeChecking(tree, args) {
            if (args.getNode().get_checkState() == 0)
                args.getNode().set_checkState(1);
            else
                args.getNode().set_checkState(0);
            args.set_cancel(true); // cancel the event and thus the automatic checking
        }

Hope this all helps.

regards,
Dave Young