[Plugin: NextGEN Gallery] Multiple different thumbnail sizes like WP media?

I was under the distinct (though possibly mistaken) impression that NextGen Gallery IMPROVED upon the standard WP media option by not just offering a full folder/directory hierarchy but building on the existing ability for users to add more than one custom thumbnail size.

In functions.php, we’re given the option to specify many different thumbnail sizes, like this:

// This theme uses post thumbnails
add_theme_support( 'post-thumbnails' );

add_image_size( 'gallery-thumbnail', 86, 65 ); // gallery thumbnails
add_image_size( 'gallery-medium', 234, 176 ); // gallery medium
add_image_size( 'gallery-large', 960, 9999 ); // gallery full size 

add_image_size( 'product-thumbnail', 86, 115 ); // single product thumbnails
add_image_size( 'product-medium', 334, 448 ); // single product medium
add_image_size( 'product-large', 480, 644 ); // single product large

But I cannot find any info about how NextGen would do this (or use the existing WP media settings above).

Am I wrong on this? If it’s not possible then I’m going to be seriously disappointed.