Is there a way to have different key bindings on the same account?

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The game is changing my key bindings across the entire account when I change them on one guy. I need to multibox with one character and raid with another on the same account. Is there any way to have it save a different set of key bindings?

I use different WoW directories for different settings. Then I symlink to the single /data directory so I don't use a ton of HDD space with multiple WoW folders.
Having separate WoW directories is important to me for three reasons - different key bindings, different add-ons, and different resolutions.