Hi Rajan,
great that this is working!
At the moment our scripts only allow the use of the two colours in PyMol (you can select which colours in the Settings panel and set your threshold manually but that is all).
I think someone else has already suggested having some kind of grading which runs the colours into one another relative to the height of the data points. I shall remind @LucaM of this when he is working on this module over the coming weeks.
Vicky