I will have a proper and careful read through your previous post and reply but right now is not really the time (my Saturday eve is about to begin!).
I would say though, as simple as it may seem (on the C64), adding a whole new matrix-colouring method into CharPad is considerably less simple than you (people) might imagine.
CharPad is itself a very complex system that already supports 5 display modes (the peculiarities and complexities of each one) and 3 matrix colouring methods (15 configurations right there, all of which need to be considered for most ops), untiled and tiled projects in 250+ different shapes/sizes, tens of different transformation ops and conversions between modes/methods, interactive image import and general file imports/exports etc etc etc.
All of these things (hundreds of C# and C++ classes) all need to be painstakingly reworked in order to add the one thing you need.
It is months of work, potentially a year or more to make perfect something that perhaps 4 people have asked about in the last 20 years.
The result? an even more complicated piece of software to use and maintain, financial gain for us? little to none I would say.
I'm not even saying "No", I guess I'm saying "Why would we bother?"
Answers welcome! :)
Enjoy your weekend.