Linked characters, one login

It would be pretty neat if you would be able to only have one login, and as you logged in, you would then be able to choose which character to be online with. Of course you could choose yourself if you wanted to let other users know, which characters you have. It would also be easier for team leaders because they wouldn't have to ask for name of others characters when looking for new team members. It would also be easier for people to make new characters, because they wouldn't have to set up a new e-mail.