Yep, you can achieve it by using the following mod:
$(function() {
$('#main-menu').bind('activate.smapi', function(e, item) {
var $deepestCurrent = $('#main-menu a.current').eq(-1);
if ($(item).is('#main-menu > li > a.current') && item != $deepestCurrent[0]) {
setTimeout(function() { $('#main-menu').smartmenus('itemActivate', $deepestCurrent); });
}
});
});
Let me know if you have any troubles.