Is there any kind of range extender that will:
1) Operate on a different channel to the wifi that's being extended
(e.g. Channel 5 instead of Channel 8)
2) Have a different SSID to the wifi that's being extended (e.g.
GardenPoint instead of KitchenPoint)
2) Use different encryption to the wifi that's being extended (e.g.
WPA instead of WEP)

I've gotten a loan of a D-Link DWL-G710 and I've been trying it out.
So far, it seems pretty shit.