[SUGGESTION] Modifying the homepage header function

First of all, I really like this theme! However, i’d like to suggest a modification to the reiki_homepage_header function located in the functions.php file. Simply adding a check to see if the function exists allows me to call my own function if I want.

if(!function_exists('reiki_homepage_header')) {
	function reiki_homepage_header() {
		return esc_url(get_theme_mod('reiki_homepage_header', get_template_directory_uri() . "/assets/images/home_page_header.jpg"));
	}
}