Global sample rate for response validation

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Hi,

First of all thanks for this great plugin. I'm just starting to use it and it seems very great. I have a simple question please, is it possible to set the sample rate for response validation globaly ?

The main reason is that in 90% case I want a 100% validation in test/dev but lower in production. This setting is usally global so it would be great to set it in one single place. This would reduce the code as I won't have to set it on every path but only when I want a specific sample rate (for some critics route maybe). The same option would be great for failAction.

Thanks a lot.