Actually somebody in the community already has - resliders.com - suppose its possible that if you are going to go through the pain of creating a slider using one of those custom options above, you could also just save it for the next time.
For me personally, I just avoid sliders. 馃槀 I've got a bank of UX reasons and user stats that show that they aren't worth the time but there's a time and place for one, so it happens.