dynamic reference lines

I'd like to be able to add multiple reference lines. And make them either fixed (eg: 80% & 20%) or variable (eg: each driven by a measure, say 1 Std Dev above & 1 Std Dev below) This would permit me to show things like :- 1. An Acceptable range. Anything too high or low is bad. 2. A typical range. where Std Dev would highlight outliers. 3. A set of Good, better, best lines. eg: sales targets often have a minimum acceptable value where you qualify for a performance bonus, The sales target, an accelerator when you get a bonus for exceeding your target. & maybe an extreme accelerator target. Would also be great if I could use the reference line to control color. either:- A. The background color above the line was different to that below the line. eg: It could be light red & the normal background was white. (for examples look at a stochastics chart in share trading. Often the background above 80 & below 20 are colored to show they are extreme values) B. When a value exceeds the reference the bar or line changes color. (We can kinda do some of that today, but only one value)