Was just looking into how this could be done, turns out you can do it without touching core code, just add this PHP somewhere e.g. your theme functions.php file:
function my_wp_fullcalendar_header_yearskip(){
?>
<script type="text/javascript">
jQuery(document).on('wpfc_fullcalendar_args', function( e, options ){
options.header.left = 'prevYear,prev,next,nextYear today';
});
</script>
<?php
}
add_action('wp_footer','my_wp_fullcalendar_header_yearskip', 1);
next update you’ll be able to do it this way:
function my_wpfc_calendar_header_vars( $header ){
$header->left = 'prevYear,prev,next,nextYear today';
return $header;
}
add_filter('wpfc_calendar_header_vars', 'my_wpfc_calendar_header_vars');
further down the line, we can look into creating a ui for this in the settings page. Currently you can only control the right side, which is the ‘Available Views’ option in the settings of WPFC.