Support for all formally used imperial engineering units such as Rankine temp. Yes I know you can write a math, but its less steps. In other words, native support for all absolute units.
C'mon Mates, you still pound pints, right?
Allow multiple Color Channels in a Mixture Map or Scatter Graph. A constant Y and X channel with a multiple 'Load' or color channels and individually selectable ways to display the color channels would open up things for more than a few of us.