Limit visual but not actual images

your plugin is AWESOME. it is the easiest way to limit gallery images.. Can you please tell me how to limit the visible images only? for example i have cars for sale.. each car shows 6 six images.. but the post could have 30 images plus. does that make sense? using your short code I loose all other attachements beyond the limit set. which i totally understand that is what the plugin is supposed to do. Anyway i need to show only six yet let my lightbox populate with more if they are there. Thanks.