I know this is more an issue with lightbox script, than with the module. But anyway, maybe it is interesting for you.

I don't like to annoy page visitors with unnecessary animation. Certainly it is not necessary to close and open the caption block every time I switch to another image.

Most naive solution would be to remove the various call to "hide()" the imageDataContainer. The problem with that is that the data container is a separate div, and does not follow the animation effects on the main image container. So, it will look broken.

I'm afraid one needs to mess with the very essentials of the lightbox script, to solve this issue.