Did manage to resolve the issue with remembering the open sliders by using a bit of javascript/jquery. Not sure if it's very usefull but in my case it does

. The script is making use of localStorage and it tracks the open/closed sliders. When open it's stored, but when closed the slider-ID is removed from localStorage.
Ah well if someone knows a better solution: you're welcome to post.
// attached a screenshot of what i meant with the bootstrap-sliders