Nice write up...

in response to

tell application "System Events"
tell application "World of Warcraft 1" to activate
key code 18
tell application "World of Warcraft 2" to activate
key code 18
tell application "World of Warcraft 3" to activate
key code 18
end tell
And not having your main WoW window back to the forefront this can simply resolved by changining it to the following

tell application "System Events"
tell application "World of Warcraft 1" to activate
key code 18
tell application "World of Warcraft 2" to activate
key code 18
tell application "World of Warcraft 3" to activate
key code 18
tell application "World of Warcraft 1" to activate
end tell
Presuming World of Warcraft 1 is you main window.