Correct, like most things with this company the e-signature is half complete. It doesn't auto-generate 8879PMT or 8453LLCs (we are California based so I mostly know about our forms) or 114a forms or the NY equivalent of the 8879PMT. Everything needs to be manually generated and attached.
That said, you can just attach the 8879PMT as another form to be e-signatured, it doesn't need to be labeled as such from their drop-down menu.