How to stop redirecting to newest URL after updating a node
There's no easy way. You might have to make your own module with code something like this:

function mymodule_node_presave(){
  $GLOBAL['dont_redirect']=true;
}
function mymodule_drupal_goto_alter(&amp;$path){
  if ($GLOBAL['dont_redirect']==true){
    $path = "";
  }
}