There is an email notification option in WF under the Requests I Have Made notification section called 'I submit a request (confirmation)' that if enabled, the user will receive this notification. You can modify the subject line but it would apply to all requests submitted, it's not queue-specific. Unfortunately there isn't more customization here natively, perhaps something with Fusion...
It's interesting that you can create custom reminder email templates for issues/tasks/etc but not for confirmations specific to a queue. It would be a good Idea to submit for votes!
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