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This is a super easy thing to add. In rt-reading-time.php on line 114-118, add the name of the filter to the shortcode_atts call. Like this:
extract (shortcode_atts(array(
'label' => '',
'postfix' => '',
'postfix_singular' => '',
), $atts, 'rt_reading_time'));
This will permit the atts to be filterable like this
add_filter( 'shortcode_atts_rt_reading_time', 'cnmd_adjust_reading_time_attributes', 10, 4 );
This has been a feature of shortcode_atts since 3.6, 5 years ago.
More info
https://amdrew.com/how-to-filter-shortcodes-in-wordpress-3-6/
https://markjaquith.wordpress.com/2013/04/04/wordpress-36-shortcode-attribute-filter/