lockout.php

<?php
/*
Plugin name: LaFours 
Description: Removes caps for actions that should take place in code, not in UI 
Author: Aaron Jorbin 
Author URI: http://aaron.jorb.in/
Version: 0.1 
*/

function lafours_map_meta_cap($caps, $cap, $user_id, $args) {
	// This is LaFours White Straw Cap
	$not_allow = array(
		'update_plugins',
		'delete_plugins',
		'install_plugins',
		'activate_plugins',
		'edit_plugins',
		'update_themes',
		'delete_themes',
		'install_themes',
		'edit_themes',
		'switch_themes',
		'edit_theme_options',
		'manage_options',
		'update_core',
		'edit_files',
	);

	if( in_array($cap, $not_allow) ) {
		$caps = array();
		$caps[] = 'do_not_allow';
	}

	return $caps;
}

add_filter('map_meta_cap', 'lafours_map_meta_cap', 10, 4);