Currently, our only setting for concurrent logins is "site wide" (not for an individual user).
It is our only line of defense for people sharing their logins publicly.
So we can't turn it off and we don't have a way to just turn it off for one person.
This feature has been added to the dev schedule and we know they are working on a solution for it but we don't have a date for when it would be ready.
In the meantime, if your device has the ability to "auto-fill" the password and login info, then you should enable that function. Then all you need to do is click the login button.