I have a lot of wow folders where most of the content is a symlink to the main except for WTF (and hardlinks for wow.exe and launcher.exe and some dll on PC and actual copy when on mac)

wow1
wow2
...
wow5
for my 5 box case
wowd1
wowd2
...
wowd4
for when I 5 box with 1 on 1 computer and 4 on this one
wowduo1
wowduo2
for when I 2 box
wowtrio1
wowtrio2
wowtrio3
for when I 3 box, you get the picture :-)

when a patch come out I have .bat file I made to re hardlink the exes,...