[Plugin: NextGEN Gallery] nggallery shortcode and add_image_size

Hi,

I have a doubt, there is a posibility to use aa new add_image_size in the gallery shortcode?

In my functions.php

add_image_size('background_slider', 1680, 1050, true);

For the theme I use this code to show the gallery on my template
<?php echo do_shortcode('[nggallery id=1 template=backgroundslide]');?>

Until here everything works perfectly, but can´t find a way yo set somethign like
<?php echo do_shortcode('[nggallery id=1 template=backgroundslide w=100 h=200]');?>
or
<?php echo do_shortcode('[nggallery id=1 template=backgroundslide size=background_slider]');?>

What I try to do is set an image size for the gallery but not using the the resize image in the gallery options.

Any help is welcome 🙂

http://ww.wp.xz.cn/extend/plugins/nextgen-gallery/