Auto Processing Zero Value Orders

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   We have a sample facility on our site whereby customers can request free sample products at zero value.  This ultimately means that they are checking out at zero value and so the payment option selection is redundant.
These zero value orders are being received as "pending status" which is usual for orders where a payment check needs to be done etc.  For zero value orders the order checking is less important so I was wondering whether anyone can think of an easy way of having zero value orders automatically receive as status "processed"

All the payment gateways have the option to choose between pending or processed but there is not a control panel option for "free orders"

Any ideas would be appreciated ?

Thanks
Matt