Would like ability to increase thumbnail scroll amount

[skullthug]

My gallery is setup a little similar to http://spaceforaname.com/galleryview/demo-default.html in that when you scroll thumbnails to the extents of the left or right it will shift the thumbnails over by one. What I would prefer is to shift by the amount of " filmstrip_size" specified instead of having to click repeatedly for each single thumbnail. So for example in the link above, the thumbnails would all shift over by 8 instead of 1 when navigating left or right.

I tried to handle this myself but ran into issues because with the way "iterator" gets set, causing weird looping behavior.