Y-Axis Scale for Custom Statistics

Hi,

Is it possible to set the minimum value of the Y-axis scale on a statistics to a custom value?  We are tracking RAM usage and are looking for fine changes, so setting the minimum value to zero results in a basically straight line.  An automatic value that is padded on either end would be great.  As an example, if your average values are 2.5 megs, your y-axis lower bound would be 2 meg and the upper bound would be 3 megs.  

In the documention, it looks like "Build Duration" is operating in the manner I describe, but I could not find how to do that.
http://confluence.jetbrains.net/display/TCD65/Viewing+Project+Statistics

Thanks,
John