Hi Stacey,
There is an option in Queue Details of your Request Queue project where you can assign an email address to capture requests. Down towards the bottom you'll find a section labeled "Email Queue Settings." Here you can assign a custom email box that routes to your intake queue in WF.
If you are savvy in Sharepoint or similar tool, you could even create the form outside WF and direct to this Email Queue with a submit button. Or train a new process where requesters attach a custom form and send to the Email Queue.
Hopefully this helps.
Best,
Joaquin