Mixed mode offline/online whitelist

I have looked around for a plugin like this but have not been able to find one. If one like this exists please tell me.

Plugin category: Admin tools

Suggested name: Mixed mode? I don't have a really good name.

What I want: Ever have a online mode server (most do) and you have a cousin or friend that would like to play on it but for whatever reason can't buy the game but you don't want to put your server into offline mode and install a password plugin. Well this plugin will act like a "whitelist". If your username is on the list you do not have to be authenticated with Minecraft but you do have to login on the chat like the plugins Authme. Until you login you can not move.

Ideas for commands: /login <password>
/register <password>
/mxm add <username> <password> (password is optional)

Ideas for permissions: mixedmode.login
mixedmode.*
mixedmode.user.add
mixedmode.user.delete

When I'd like it by: The sooner the better.

 

It not possible to create a "mixed" mode plugin without modding the craftbukkit.jar (server).

 

Bukkit doesnt like offline mode

 

'Cracked' servers are bad and you should feel bad.

 

I can't think of a single valid reason for not buying the game, we only support online mode though.