I'm trying to configure per-key RGB settings in Keychron Launcher, but I'm having trouble turning off specific keys by selecting "pure black" (R, G, and B values ​​all set to 0; color code #000000).
Specifically:

• If I try to set R, G, and B values ​​to 0, they are automatically forced to 30, preventing me from selecting pure black.
• While it is possible to type "#000000" directly into the color code field and immediately click "Save", making it appear in Launcher as if I successfully selected pure black (i.e., turned the light off), the LED actually lights up white.

Hoping there might be a workaround, I cloned the official Keychron QMK source, changed some of the default RGB settings in ansi.c to {HSV_OFF}, and compiled it; however, the LEDs in those areas still lit up white.

There are other issues, too.
For instance, when entering "#800000" (R: 128, G: 0, B: 0) versus "#FF0000" (R: 255, G: 0, B: 0) in Launcher's color code field, there is no visible difference in the red LED's brightness; they look exactly the same.
This behavior seems strange compared to RGB/QMK keyboards from other brands.

Questions:

• Is there a way to turn off the LED for specific keys?
• Can the issues above be resolved by editing QMK source files like config.h or rules.mk?

Related post:

https://www.reddit.com/r/Keychron/comments/1r3miwe/issue_with_per_key_rgb_on_q1_max_defaulting_to/