I use a Logitech MX Keys keyboard with my pc. I find that some times on certain applications the illuminated keys don,t seem to stay on long enough and then don't always come back on again when my hands get near to the keyboard. I find my self waving my hand over the keyboard to get the keys illuminated again. I think that a useful feature would be the ability to choose between keeping the keys illuminated or illuminating the keys when hand movement is detected. An alternative would be the ability to alter the time interval that the keyboard waits before switching off the keys illumination. I appreciate that it would reduce the battery life so maybe the feature may require that the charger is plugged in to use the feature. I don't know if it even possible to do this but it just a suggestion.