Long forms anchor at the bottom #9

If you have a long form with a lot of fields the modal opens at the bottom of the form. Not a huge deal, but you do need to scroll up to see the beginning of the form.

I believe that this is because the insert submit button is being focused on:

https://github.com/jtsternberg/Shortcode_Button/blob/master/js/shortcode-quicktag-button.js#L179

$c.modal.find( '.scb-insert' ).trigger( 'focus' );

Is it possible to focus on the first field instead?