Custom Admin Screens Per Username

I forget where, but I came across this handy code to modify the admin screen for non-administrator accounts…

function remove_menus () {
global $menu;
if( (current_user_can(‘install_themes’)) ) { $restricted = array(__()); }
else { $restricted = array( __(‘Posts’),__(‘Links’), __(‘Pages’), __(‘Tools’), __(‘Users’), __(‘Settings’), __(‘Profile’)); } // hide these for other roles
end ($menu);
while (prev($menu)){
$value = explode(‘ ‘,$menu[key($menu)][0]);
if(in_array($value[0] != NULL?$value[0]:”" , $restricted)){unset($menu[key($menu)]);}
}
}
add_action(‘admin_menu’, ‘remove_menus’);

…and I was wondering if it is possible to do something similar to this, but for a specific user at a time. For instance, you create a custom post type that you want someone to author, but you don’t want them to have control over anything else on your site.