I wouldn't touch it with a 10 meter barge pole.
There is no way that I would allow total strangers a) to connect to the internet over the address that is traceable via the ISP to ME, and b) share my home network.
HTF can you implement WEP or WPA? Have strangers ringing on your doorbell saying "'scuse me, but if your WIFI network is called ACME, can I have the WEP key please?"
"Roam away from home"? Cr@p - I'm in an airport / hotel / rail station / downtown - so how many domestic foneroos are going to be in range? F**k-all.
Sounds like complete b0ll0x to me!
But then I'm just an IT consultant.
SD