This is similar to the problem I found with attempting to re-add the encumbrance bar within the unitdetails.wnd file within the screen folder.  As far as I can tell it is only modifiable to add additional choices beyond 5 is to modify the file through DesktopX.  You can modify the name of the different paths in the meantime unless you are trying to add a new one you are stuck for now until someone learns DesktopX, or someone who already knows it can lend a hand.  I am going to try to eventually learn it but it looks a little daunting as I have only had a basic C programming class along with poking around various games files for simple scripting and xml manipulation.

You can easily create 5 new paths over the existing ones, however, I do not think you can have 5 different paths for sovereigns and 5 different paths for champions and different paths for empire and kingdom, if you get my meaning. What you might be able to do though is have your 5 paths give different abilities to different factions and different abilities for sovs and champions.

You could definitely have 2 completely different versions of the same path using the Allegiance prereq.

Can't think how to split the Sov and Champion paths though.  I have some new paths that are intended for champions (and not Sov's) but haven't been able to stop them being chosen by a Sov.  In fact i've had a pretty good go at it and can't find any way to restrict access to a Path at all

Aye so you can change the names to say a category such as magic then for each trait tree within that tree you would then have a second prereq for the specialization it is for.  So you could in theory have a nature magic tree a fire magic tree or any other kind depending on how you set up the initial prereq.

It isn't necessary to hide them. Since traits accept both a prereq for abilitybonusoption AND unitstat, you can simply have mutually exclusive trait "branches" inside a tree.

trait 1: give 1 unitstat_x

trait 2:1 - require 1, require 1 unitstat_x, subtract unitstat_x on pick

trait 2:2 - require 1, require 1 unitstat_x, subtract unitstat_x on pick

now you can only pick either 2:1 or 2:2

Here's what it looks like when you are fulfilling the prereq abilitybonusoption but failing the prereq unitstat: http://i.imgur.com/1WtaRCa.png

Thats what I was saying heh.