Location is still pretty much work in progress - however the optimal
'range' (which is not so meaningful anyway as it doesn't use
battery-draining GPS) is now calculated automatically. It just serves
as an indication, nothing more - so e.g. if you live in an area with
an extremely coarse network-powered location provider, you can see the
very large range and might decide to disable Location altogether.
Keep in mind that Location's job is to _disable_ WiFi. If you want to
have WiFi otherwise always on, simply disable the 'WiFi' button on the
triggers top row - voilà (Location will take care to 'Auto Disabling'
WiFi anyway when needed).