It looks like no matter what number is set in Slide by configuration the slider will only move 1 slide at a time. Also noticed that on your demo site in the code it says slide by 3 but it is only moving by 1 so the issue does not look to be localized with the site I'm working on.
Hi, you got that right! and thanks for your post. I'm going to inform the developer team, they'll update the plugin asap.