Would be very nice if the wifi power options were specifiable per access point instead of globally. Some routers/locations work great with things turned down, others not so much.
I might be wrong on this this, but I think that the setting refers to maximum output, i.e. even when setting to 100mW it won't consume that always, it will conserve power, and consume up to 100mW when needed. So the users do not really save power by switching manually between 10mW and 100mW...