Request: multi-head printing?

Hello,
I have a 2 tiered feature request- one is very simple, and one is more complex. I can separate them into two issues if needed.

1. support multi-head filament changes.
   This means that some printers (like the snapmaker u1) can have 4 filaments ready to load at once. What I'm requesting is a mode where I can set it up such that I only need to swap the filaments once every 4 changes. This support is the simple feature: make it so I can set it so that I have N-printer heads, and only stop after printing N different colors to swap filaments.

2. More complexly, this means that with N filaments, you can 'batch' layers.
   Say the color order Red-White-Pink-Grey would represent a pixel 1 extremely well. This is good for us. but not all pixels are the same color as 1. some pixels, maybe a pixel 2, would be better represented by the order Red-Grey-Pink-White. With 4 filament heads this is extremely simple for a user to do, and is 100% automatic. so given that for every filament Td < N * Layer_height, the number of unique shades and hues that can be made with N printer heads in N layers is N^N (256 for 4-heads, 3,125 for 5 heads, etc), and the only cost is the time it takes to do N * (N - 1) tools switches (ie tool_heads * layer_count-1), which is automatic.

I'd like to formally request both, but I understand that the optimization algorithm for #2 is.. well, a big challenge, as this means that every group of N layers can be shuffled, and even repeated/omitted if preferable. I'd be happy to lend a hand in programming either of these if contributions are open.

The issue describes separate multi-head filament-change support and a more complex layer-batching optimization, but names no files, tests, or entry points. Start by clarifying whether the simple request should be split from the optimization work and how the proposed behavior should be specified. Done would require an agreed scope and acceptance criteria for the selected feature.