How can I allow a Dashboard viewer to add comments to their requests?

I set up a service request Sheet, a Report that pulls from this, and a Dashboard for the Requestor to see the status of their requests with the gadget for Reports. How can I share this Dashboard with the Requestor and allow them to add comments to their requests whenever they want without sharing the underlying Report and Sheet as an Editor? I don't want the Requestor to be able to edit their request directly in the Report or Sheet, only add comments that show up in that row. I also don't want to clutter up their own Smartsheet account space with other underlying documents like Reports and Sheets... they only need to have a Dashboard.

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