dont hold me to it but, because those adapters have to comply with the usb keyb/mous hid rules, it should be no different dont you think? if your comps bios supports usb keybs, a good test i would think is to get one, plug it into you comp and see if you can press "del" to get into setup when your comp starts, if it does then its acts like a standard hub with a generic usb keyb and mouse. make sure you r bios supports usb keyb in the first place though. myne does and its like 4 years old so.
just ideas not facts though so...