Genesis Prose Extras plugin - list of Hooks & Filters for customizations; since plugin version 1.0.0 // Plugin page at WordPress.org: http://wordpress.org/plugins/genesis-prose-extras/

custom-css-hacks.css

/** The following rules should be added to Prose Custom CSS (global) */


/* Custom Width for Home Left & Home Right Widget Areas
------------------------------------------------------------ */

/* For Home Left Area */
#prose-home .gpex-columns.one-half.first {
    width: 58%;
}

/* For Home Right Area */
#prose-home .gpex-columns.one-half {
    width: 38%;
}


/* Neccessary Media Queries
------------------------------------------------------------ */

@media only screen and (max-width: 320px) {

	#prose-home .gpex-columns.one-half.first,
	#prose-home .gpex-columns.one-half {
		width: 100%;
	}

}

genesis-prose-extras-custom.php

<?php
/** Do NOT include the opening php tag! */


/** Genesis Prose Extras: Add post type support for (single) Custom CSS: */
add_post_type_support( 'download', 'gpex-inpost-css' );
add_post_type_support( 'product', 'gpex-inpost-css' );


/** Genesis Prose Extras - disable plugin feature: Better Custom PHP file */
add_filter( 'gpex_filter_better_custom_php', '__return_false' );


add_filter( 'gpex_filter_inpost_custom_css_cap', 'gpex_inpost_custom_css_cap' )
/**
 * Genesis Prose Extras: Custom Capability for Inpost Custom CSS
 */
function gpex_inpost_custom_css_cap() {

	return 'editor';
	
}  // function

Note: The above codes work with plugin version 1.0.0 or higher!

Extended explanation can be found at the plugin's page "FAQ" section:
http://wordpress.org/plugins/genesis-prose-extras/faq/

Download "Genesis Prose Extras" plugin at WordPress.org:
http://wordpress.org/plugins/genesis-prose-extras/