Isn't such a big deal, all you have to do is:
*Copy-paste one of your actual cores;
*Change the name, for your new core in CONFIG, and also change ports for that new core;
*Reasign maps in MAP_ALLOW;
*Make correct symlink, to point the game, from your new core;
*Add the core into your start/close/clear shell scripts;
And pretty much that's it.Now you're done, you have a new core.
*Copy-paste one of your actual cores;
*Change the name, for your new core in CONFIG, and also change ports for that new core;
*Reasign maps in MAP_ALLOW;
*Make correct symlink, to point the game, from your new core;
*Add the core into your start/close/clear shell scripts;
And pretty much that's it.Now you're done, you have a new core.