Jquery different data trapped from direct mousedown event and simulation via $(this).trigger('mousedown');

I need to trap some data in my webpage then user make a mousedown event or simulate it when user press TAB key on a page element. For mousedown i use standard code like:

$('*').on('mousedown', function (e) {
    // make sure the event isn't bubbling
    if (e.target != this) {
        return;
    }
    //...my code
 });

and all work done, for TAB key pressure i use this code for simulate mousedown event

$(':input').keydown(function(e) {
  var keyCode = e.keyCode || e.which; 

  if (keyCode == 9) {
    $(this).trigger('mousedown');
  }
});

and all seems to be done, but then i look at the e data with

console.dir(e)

there are many difference and in second case many missed data:

SAME ELEMENT CLICK AND TAB EVENTS

CLICK mousedown event:

TAB and with $(this).trigger('mousedown');

There are far fewer data!! For example i need e.pageX and e.pageY parameters but if i trigger event there aren't. How can i have the same e data on both case??

Thanks in advance