Best available alternative (thanks to Pieter van de Braak!): create a small piece of code that reads through your deployment directory and scans for all files present in the deployment/web/<insert language="" here="">/forms/<all folders="">.
You can do this inside the Modeler. Use the advanced find feature (Ctrl-Shift-F) and search for Documents where Document Type is Web Forms. That should give the list you want
Edit: I see you are on version 3.x Search for Forms instead of Web Forms