Clean-up script tags

If you really want to do this, then it should already be possible.

The global $wp_scripts is an instance of the WP_Scripts class, which is an instance of the WP_Dependencies class.

So in theory (not tested), you should be able to do something like this:

function alter_script_tags()
{
    echo '<pre>';
        print $GLOBALS['wp_scripts']->print_html;
    echo '</pre>';
}
add_action( 'wp_enqueue_scripts', 'alter_script_tags', 999999 );

This is just a rough sketch, but you should get the idea.