Also, explicit confirmation of your customizations and of your order. You can double check yourself to make sure it’s all correct before submitting the order while the distracted and overworked employee at the counter could hit the wrong button or skip a customization and you often wouldn’t know until you receive the wrong item. Then you have to create more work for the workers to get your order remade.
I’m not familiar with KDE’s new feature yet, but if it only supports sysfs LEDs then it won’t control 99% of keyboards. Few RGB keyboards have drivers that expose this interface. Most RGB keyboards are controlled from userspace on their official software on Windows, and that’s also what most Linux projects that control RGB devices including my OpenRGB project do. I wonder if it would be possible to write an OpenRGB plugin/script that exposes a virtual /sys/class/leds/openrgb device that KDE could talk to, then translate that into OpenRGB calls to set the color on all available devices. It doesn’t sound too difficult.