Heatmap - List of features I would like to see

Here is a list of features that I wish were available for the vizlib heatmap:

• formula for color expression similar to pivot table/make it possible to choose on which kpi the coloring is based on 
• add a totals (or even custom) column with the ability to choose on which side it should be (left/right/top/bottom)
• make it possible to add more than 2 kpis (you can see them only while hovering anyways, so why limit them?)
• make it possible to use different coloring before/after a Reference line