So what I'm asking here is to add one option to connect to one more server
I understand that you want to have your private ed2k server inside of your private network ?
It won't work for very simple reason - you can't have 2 ID's. And you can't really fix it - it's built-in into 2d2k protocol.
But why do you came with this idea in the first place ? If you have private net, and only 1 outgoing inet link - running more than 1 mule have no sense. But if each of you have separate link, you may considering to use link aggregation and again - run only 1 mule.