ASUS claims that there's no way to leave the keyboard backlight always on. Their reasons? Power consumption. I mean, I only have an 8 core CPU and a RTX 3050 Ti in here, but it's the keyboard they're worried about...
I found a YouTube video with instructions, but it doesn't match my registry: https://www.youtube.com/watch?v=5eXD_PMJK4M
The video says the registry path is this: