I don't know what you mean by Recovery Staff but if they are setup as a salesperson you can enter a Commission percentage. But that's as far as Nav goes. Every company can handle commissions differently that's why there is no blown out commission control on nav. If your looking for something more than a sep percentage you will have to develop it yourself (perhaps a custom report)
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or a 3rd party add-on
http://pinpoint.microsoft.com/en-id/app ... 2884914855
http://www.BiloBeauty.com
http://www.autismspeaks.org