Calamares VS eliveinstaller VS others, brainstorming

If we seriously can't find a way to put it before, can we at least put that step at the end ? in my experience i left my computer installing, then when i came back an hour later it was asking for username/password, and then it took another fifteen minutes to configure the installed system. is it possible to set the user up after the configuration of the installed system?

(that was a long time ago, the installer could have changed from that, so correct me if i'm wrong please)

also, would be handy to be able to set up multiple users at once in the users manager/elive installer