Correct, this is not possible today. Even if you disable "Verification" it will still create a username/password combination. But honestly speaking, from a tracebility perspective allowing any email address without verification is equal to the "Anonymous" option, which you can use today. There is zero added value IMHO.
There are existing ideas on the Aruba Innovation Zone, if you have a partner login make sure to vote for them to increase the likelihood to get this implemented: https://innovate.arubanetworks.com/
Otherwise, reach out to your Aruba partner/account team to make them aware of it.