Hello! I have written an small beanshell startup script, that does save all modified buffers on jEdit focus lost. It's useful on html/css/php etc. development when you need an result of your changes frequently in other application (browser, curl-output etc.). Since I have not found how to upload it, I just put it here as is (put it as ~/.jedit/startup/Save-On-Focus-Lost.bsh)

EditBus.addToBus(new EBComponent() {
    public void handleMessage(EBMessage message) {
      if (message instanceof EditPaneUpdate) {
        if(message.getWhat() == EditPaneUpdate.CREATED){
          Log.log(Log.MESSAGE, BeanShell.class, "adding deactivation listener... ");
          myView = message.getEditPane().getView();
          myView.addWindowListener(new WindowListener(){
            public void windowDeactivated(WindowEvent e){
              Log.log(Log.MESSAGE, BeanShell.class, "windowDeactivated event");
              oppositeWindow = e.getOppositeWindow();
              if(oppositeWindow == null){
				  Log.log(Log.MESSAGE, BeanShell.class, "application is loosing focus ");
				  //jEdit.saveAllBuffers(myView,false);
				  jEdit.saveAllBuffers(e.getSource(),false);
              }
            }
            invoke( name, args ) { };
          });
          Log.log(Log.MESSAGE, BeanShell.class, "success");
         }
      }
    }
});