STAR WARS™ Empire at War: Gold Pack

STAR WARS™ Empire at War: Gold Pack

EaWX: Thrawn's Revenge 3.4 (Updated April 2nd)
Editing local files
I would like to add and/or change little things in the game but locally. For example, I would like to be able to build boarding shuttles during all eras, not just era 2, and for all factions. Any ideas about how to do it?