This should no longer be required after 4.6.4 as there is an option in the Gateway settings -- Adds a little jQuery to automatically open the Payment options.

ee_add_jquery.php

<?php
/*
Plugin Name: EE adds JavaScript to show the payment options automatically.
Description: EE adds JavaScript to show the payment options automatically.
*/
/* Begin Adding Functions Below This Line */


function ee_1() {

	if(is_singular()) {
		?>
		<script type="text/javascript">
		jQuery(document).ready(function() {
			jQuery('#spco-go-to-step-payment_options-btn').click(function() {
			if (jQuery('.reg-page-payment-option-dv').length == 1) {
				setTimeout(function(){jQuery('.reg-page-payment-option-dv').click();}, 2000);
			}
			});
		});
		</script>
<?php
	}
}
add_action('wp_footer', 'ee_1', 100);