The pro/con of multiple installs... is a monumental waste of space.
If your software does not virtualize the configuration file (to my knowledge only IS Boxer and PB do that), and you want varying levels of audio/video options in warcraft your best option is symbolic links.
Have a single parent install of the game.
A full install, with everything there.
Then create one copy of the game, per set of varying settings you'd like.
Quite commonly, this is three versions.
- A high settings, for when you run a single account.
- A medium settings, for your master/leader account.
- A low settings, for your slave/follower accounts.
Then you delete the Cache, Data and Interface folders from each of the copies.
And symlink them to the parent install.
Which gets you 15-50MB per copy of the game.
And the single full install of 20GB or so.
If you go with SymLinks, break the links before a patch.
Patch the parent copy of the game.
Redo the links.
And copy the new wow.exe from the parent folder to each copy.
I'd take a hard look at IS Boxer.
It has a ton of features which cannot be found elsewhere.
Automatic FTL, which is the strongest form of assist (no need for Focus, or Target or Leader).
Mapped Keys, which are incredibly flexible (Steps, Advance/Reset options, Variable targets, etc).
Click Bars, which are like hotkeys (mapped keys) that can be clicked from any window.
Repeater Region healing, heal from any window via mouse clicks.
Virtualized files, the configuration file is the obvious example but you could virtualize an addon if you wanted.
Instant swap from one region to another.
Very accurate mouse broadcasting, click portals/target ground spells/pick talents, etc.
Great support, regular updates/fixes, and a continually evolving software.
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