Berserker/beastlord/froglok/vah shir have a client side mechanic to be locked out, as they required specific expansions to use and p1999 can fake that trigger.
Gnome sk/ paladin and halfling ranger/paladin were straight added sometime after luclin with no such limitations. This means they are out of period for us, but there is no built in mechanic to exclude the , so instead they are excluded with a clunkier hack.
Sorry you didn't get shadow gnome
[You must be logged in to view images. Log in or Register.]. I very much desire a halfling ranger myself!