Shortcodes for Slide show using random images from selected galleries…

Hoping someone can help me here to resolve the shortcodes I am missing for what I want to accomplish.

Using short code I want to:

(Add a slide show that displays a limited number of selected random images from within specified galleries.)

1. Add a slideshow to a page (not thumbnails).
2. Include only specified galleries.
3. Select random images from within the specified galleries.
4. Limit the number of images that are selected and displayed. (with no pagination)

Here is the shortcode I am using based on what I found here:
http://www.nextgen-gallery.com/nextgen-gallery-shortcodes/

Shortcode:
[ngg_images source=”random” gallery_ids=”3,5″ maxImages=”6″ display_type=”photocrati-nextgen_basic_slideshow” ]

Result:
All images from galleries 3 and 5 are displayed, in order, in the slide show format. (Nothing random about it at all.)

There is nothing listed on the shortcodes help page that indicates the short code for limiting the number of selected or displayed images so that ‘maxImages=”6″‘ is the last thing I have tried that doesn’t work. I have tried:

maxImages=”6″
items=”6″
limit=”6″

which is based on what I was able to find digging through the source code files related to shortcodes, but no luck.

Again here is what I would like to do, (which I cannot do using the ATP interface – the only choice for random is to select random images from all galleries that exist):

Using short code I want to:

1. Add a slideshow to a page (not thumbnails).
2. Include only specified galleries.
3. Select random images from within the specified galleries.
4. Limit the number of images that are selected and displayed. (with no pagination)

Additional question..is there another page somewhere that lists all possible shortcode options that are available?

http://wordpress.org/plugins/nextgen-gallery/