You can overwrite any command of Cute Editor.

 

Demo:

 

 

If you want to overwrite the paste command.

 

You can add the following code in the bottom of your page:

 

<script>

function CuteEditor_OnCommand(editor,command,ui,value)
{
 //handle the command by yourself
 if(command.toLowerCase()=="paste")
 {
  alert("handle the paste command");
  return true;//return true if you want to stop the command
 }
}

</script>