Just a suggestion, you might want to use Darth Mod.
it adds some historical corrections as like for Great Britain a colony in India
, retextured uniforms, correct flags, and more stuff like it adds Highlander & more units for Great Britain and since their latest release 6.2 the Pikemen units fight with their pikes instead that they swap to their swords.
and you can still play stock if you launch ETW normally throught steam.
if you're interested :
http://www.twcenter.net/forums/showthread.php?t=341088
HunterICX