The Addon allows you to easily set the max camera distance to your favorite and zoom out as far as possible. It saves the settings accross the account so no new setup is required. Beside of the max camera distance macro it is fired automatically everytime you reload and sign in into a character.
The World of Warcraft default zoom distance is set to 2.
This translates to:
1 = half maximum zoom distance
2 = default zoom distance
3 = further zoom distance
4 = max zoom distance
by installing this addon zoom distance will automatically be set to 4.