support 'editData' property in <jqgrid:navigation>

A common use case is to pass additional parameters to the URL specified by editURL. Therefore jqgrid has the 'editData' property, see http://www.trirand.com/jqgridwiki/doku.php?id=wiki:navigator. My current approach is to omit the <jqgrid:navigation> tag and add manually the following code:

<pre>
<jqgrid:grid id="mygrid" ... />
$("#mygridGrid").jqGrid('navGrid',"#mygridGridPager",
{},
{editData: {'someReference.id': $

}}, // edit
{editData: {'someReference.id': $

}} // delete
);
</pre>

It would be very nice, if we could have this as a part of the navigation tag.