Ability to change Page Template?

If you want to use a different template than the default page template, the only way that I know of to do it is to add code to your theme to use a different template for the campaign pages by hooking into the page_template filter. For example:

add_filter( 'page_template', 'pfund_custom_page_template' );
function pfund_custom_page_template($current_template) {
    global $post;
    if ( $post && $post->post_type == 'pfund_campaign' ) {
        return locate_template( 'campaign-template.php' );
    } else {
        return $current_template;
    }
}