I think it would be valuable to have an option to set increments for the slider. For example, I want a map of travel times, that can be filtered by the various time increments. I have 15, 30, and 45 minute travel times. I don't like the drop-down as it feels slower and cumbersome when there are only a few options. But the slider is doesn't allow me to set increments. So I end up with say 31 minutes. The filtering works fine, as I have it set to less-than or equal to. But if I wanted it exactly at 30 minutes, I would have to fiddle with the slider.
Instead, being able to set it to 15 minute increments would be faster and easier for both the creator and user. Additionally, since we have the option to use statistics to get the min/max, just having a list of the unique values, and having the slider set to those, would be even better.
Ultimately, we need more control over the slider increments.