Ok well that all sounds very complicated!
Right now I can't quite visualise what you are trying to do but thanks for trying to explain.
CharPad's tile (pixel) editing features are pretty unique, no other tool that I know of can do such things and it formed a large part of the reason we made it, but, as you are finding out, there are certain restrictions such as the need for decompression to avoid affecting "other tiles" when (pixel) editing any one chosen tile.
(nb. you are only really free to use the Char Brush tool in the tile editor without first using decompression).
Re your second request.. Yes other colouring methods are possible, namely "Per Map Cell" and "Per Tile Cell" .
Literally "a couple" of other people have requested these colouring methods before now and these things are actually on the todo/maybe list, however, to be perfectly blunt about it..
It would require an *enormous* amount of work to add these things and the income generated from these apps gives us very little motivation to even attempt it.
Sorry.
Maybe it will happen if business picks up considerably or if we were to get offered proper payment (privately) for the necessary months of work.