There is a more convenient option than the extension cable, namely a USB HUB, there is already 4 ports, there are 6 and 8 port usb hubs. Just need to decide what devices does the hub, if you connect power-hungry devices (external hard disk, scanner), then you need to take an active hub (with power supply) for about 500-700 USD, if just for flash drives, etc., suitable for passive 250-350 R.