When gathering feedback you can include customer information, such as their email, Twitter account, and source of the request (like a support request.)
You can use this information to get back to the client directly!
We generally recommend exporting the feedback within the idea itself, that way you can export all necessary data in a CSV.
TIP: Once you have alerted the customer that their request has been made available, be sure to archive the feedback. This way it doesn't remain active in your backlog!