More Tint Customization

What this is above is how the color of biomes are determined. Each biome is given a certain area on the triangle and when two biomes merge they're able to use the pixels between each others area to give a fade effect. If you were to change the hue of this triangle you could make some very interesting texture packs, which is what I'd like to do. However, there are multiple issues regarding color maps, that being that Spruce and Birch leaves do no use this color map. Birch and spruce trees instead use data hard written into the game itself to determine their colors, so no texture pack can change those two tree colors. This leaves texture packs that are edited to have a different tint to look much worse whenever one of those trees are present because they simply don't fit with the rest of the texture pack and end up looking jarring and gross. There are other features that don't use this color map such as swamps, badlands, and flowers (flowers never have used a color map but they still have the same problem and could benefit from one). In bedrock edition, swamps have a custom color pallet that you can edit alone. I'd like that to be implemented for the rest of the previous features in java. I'd like to see stand alone color maps for spruce leaves, birch leaves, swamps, badlands, and flower stems so they can be edited within texture packs and allow for much more creativity in how people can have their game look.