Add username field (instead of using email as username)

Currently, this plugin is using the customer’s email address as a username (created automatically). The main issue is that this private information becomes visible on other parts of the website, like for instance on a forum when usernames are visible (appears like that: @customeremail-com). This is a major privacy issue.

is there a way to add a field “username” to the autoregister checkout page, in which customers could choose a username that is not their email?

Thanks!