It would be nice to have an option to automatically set symmetrical limits; maybe “Auto-scale Symmetrical”. Right now the automatic methods set the min / max based on the data ± some margin to generate a nice scaling. Especially for residual plots limits symmetrical around zero would be more informative, IMHO. Something like [color=#0000DD]AxisMin =-max(abs(data))-margin. AxisMax=+max(abs(data))+margin[/color] should do the job.