Currently, MX Keys and MX Master 3s mice only use the USB connection for CHARGING. I'd REALLY like to see the USB connection be able to function as a WIRED mouse and WIRED KB as an option to connected (in ADDITION to Bluetooth/Bolt or Bluetooth//Unifying dongle). Could this be accomplished with a SOFTWARE/FIRMWARE update to the KB / Mouse? If this is a physical impossibility for the MX Keys & MX Master 3s products today, please consider ADDING that support in future products. It really doesn't seem like any cost would be added to have a WIRED option. (In fact, for a $120 keyboard, I'd have expected that functionality to have been built-in).

NOTE: Since there are only three lit button/indicators to select WHICH device the kb or mouse are connected to, maybe press ALL THREE buttons on the KB for Wired USB communication and press the device selector (1, 2, 3 on the mouse until all three indicators light up) for WIRED mouse mode.