Thanks for the kind words. Remember to give it a nice rating if you like it! :)
And for your question, you could try this:
// Fetch field info using a method in the simple fields class
$field_info = $sf->get_field_by_slug($your_field_slug, $your_fieldgroup_slug);
// Show the output. Somewhere there the description should be...
Maybe I should add the field name and description automatically to the output when using Extended Return Values. Probably more users/developers than you who need that info. Anyway, let me know if you get it to work or if you run into any problems!