The only way I can think to accomplish what you're asking in a very roundabout way is to have the person you're restricting use another email from home, then simply make another folder to which the home/personal email address won't be added to. The only issue here is that you'll basically be copy/pasting contents and filling up your Dropbox space, but it could possibly work. Just make sure you know which email is being used on which device. At least until the feature is supported. The biggest issue with this is if those individuals have access to their work emails from home. In that case, there's not really a way around it yet.
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