This optional parameter forces Radiator to honour a
Framed-IP-Address in an Access-Request request unless it is overridden by
a Framed-IP-Address in the user's reply items. If you enable this, then
users will get the IP Address they ask for. If there is a
Framed-IP-Address reply item for a user, that will override anything they
might request.
# Let users get addresses they ask for
UseAddressHint