Maybe a landing page when you logon from an ip that has been used on another account.. so you get a pre warning to say are you sure about logging on on another account.. continuing will automatically evict you from active games and you won't be able to enrol in any games for 7 days (or whatever it is that you have to wait until you logon another account with no risk of red noses or bans etc)
bengalboy some people get red noses by no fault of their own I've had it happen by logging on with o2 data a few years ago so an outright ban is not s good idea imo
jouix LOL yeah i got a ban like that years ago but i think they fixed it. regardless if they have a warning page people will just go "oops! let me put my proxy on!"