Hello dfreye,
There is a global setting for the time when Method will auto-log off. It can be found by going to Customize -> My Account -> User Password Preferences. In the screenshot below, it is set to the default time of 180 minutes. Unfortunately, there is no way to have unique auto-log out times for individual users. Also, there is no settings to say to kick out a user in one role if another 'higher' role logs in and goes over the number of concurrent licenses available.
Greg