This tabular form allows you to navigate through the fields by holding down the control key and using the arrow keys - as described here: https://forums.oracle.com/forums/thread.jspa?threadID=2526996&tstart=0

1. Give the tabular form a static ID. I called this one arrow-tabular.
2. Create a new dynamic action:
   Event: Key Down
   Selection Type: jQuery selector
   jQuery Selector: #arrow-tabular input
   
3. True Action: Execute JavaScript code
   Code:

   
   var baseSelector = '#arrow-tabular input[type!="hidden"]';
   
   if(event.ctrlKey){
       event.preventDefault();//i.e. stop scrolling
       switch (event.keyCode) {
           case 37:
               //left
               var prevElIndex = $(baseSelector).index(this.triggeringElement)-1;
               $(baseSelector + ':eq(' + prevElIndex + ')').focus();
               break;
           case 38:
               //up
               var name = this.triggeringElement.name;
               var row = $x_UpTill(this.triggeringElement,'TR');
               var prevRow = $(row).prev();
               $('input[name="' + name + '"]', prevRow).focus();
               break;
           case 39:
               //right
               console.log($(baseSelector));
               var nextElIndex = $(baseSelector).index(this.triggeringElement)+1;
               $(baseSelector + ':eq(' + nextElIndex + ')').focus();
               break;
           case 40:
               //down
               var name = this.triggeringElement.name;
               var row = $x_UpTill(this.triggeringElement,'TR');
               var nextRow = $(row).next();
               $('input[name="' + name + '"]', nextRow).focus();
               break;
       }
   }
   
   

4. It is important to update the dynamic action and specify the Event Scope as Dynamic, so that and additional rows that are added are still affected.