This post by Finn explains all...
And this post explains how to run the ExRM with Alexander.exe (by Lord Nova):
http://www.twcenter.net/forums/showp...&postcount=750
Here's what to do if you get a stringtable error:
http://www.twcenter.net/forums/showt...=255317&page=2
This thread elucidates the trait file alterations a little more:
http://www.twcenter.net/forums/showthread.php?t=397418
Note: Unfortunately, v4.0 makes use of hording, so it's incompatible with Alex.exe