I feel a common use case for this module is to add a lot of users to the same group with the same welcome message.

The form currently provides a button to "add" and then it gets reset to the default state.

It would be nice if the form would instead submit and rebuild itself using the role, groups, and welcome message from the last user as the defaults for the next. I could also see this as a new button on the form so we have [Add] [Add and use as default] or something like that.