It's part of the Blizzard addons tab, so I don't think it uses the Ace3 slider widget. Barring making the slider a whole lot more sensitive, a slash command would be great. Anything where I can adjust and align size and position to the pixel.
Am I missing something? I have a bar below my action bars. I'm trying to change it's width to be exactly the same as my action bars, however the slider's granularity leaves much to be desired. Is there some place to type in then number?