This update finally solves the problem while MultiLobby was combined with a lobby plugin that allows players to choose lobby via inventory menu!

To install this update:
1. Download the new jar
2. Insert this new line into your multilobby config:
lobby-to-lobby-balancing: true

So from now, if you disable lobby-to-lobby balancing your players will be able to teleport from one lobby to specific another lobby even via the bukkit plugins, to that moment the only option how to teleport to defined lobby server was using commands /lobby <num> and /hub <num>


From now you can make such a nice lobby switch menu like this:

(Screenshot taken from mineplex)