Yes, you can use any USB extender. Or, be like most people and plug it into the keyboard (it has a hub, and has power, that is why it has a special modification of the USB port, so the extender will only work with it.
I plug my Mighty Mouse into my keyboard and then have a generic USB extender (I got it from Best Buy) going from my keyboard to my iMac. I had to do that because I have my keyboard/mouse on a pull-out-drawer under my desk and the cable was too short.