yes, I've read the instructions (a number of times). That property is set (True). I just copied the existing nsOptions, I tried it with False as well.
The problems I see are:
1). there is no way to tell 'function lightbox(idx)' which slider the images are for.
2). there is no way to tell id="fsBtn" which slider the lightbox applies to
3). 'function fsIconClick(isFullscreen)' has "ninja-slider" hardcoded in it, so for multiple sliders you cant say which one it applies to.
I have added code to solve 1) and 2), but unable to for 3).
Most importantly... even if you only have just 1 slider, if you rename it everywhere to nsOptions1, #ninja-slider1, etc., it no longer displays correctly. Its selected, but isn't displayed full screen properly (only partially without any image), there are no side scroll bars, and it doesn't collapse. So I don't think it supports multiple sliders.