Topic: restful authentication & cookies

I'm having two problems with the restful authentication plugin:

1. the cookie works for foo.com but not www.foo.com.  I tried adding a :domain => foo.com in my controller like so but it doesn't seem to work.

cookies[:auth_token] = {:value => self.current_user.remember_token, :domain => 'food.com', :expires => 90.days.from_now}

2. If a user logs in with the remember_me it does work, but if there's already a token in that field when he logs in then it doesn't get overwritten.  That means you can click 'remember me' from Browser A, but if you also click it when you log in from Browser B it will never remember you on Browser B.

Anyone worked around these before?