If one session limit triggered, make delay before next login permitted

Here is another feature request regarding the session limit feature:
Despite the session limit, it's still possible to trade one set of login credentials among many users. The only consequence to being Auto Logged out is that you just have to log back in again. When users are willing to put up with this inconvenience, then the session limit could use improvement. Could there possibly be a delay enforced before the next permitted login so that users can't trade back and forth so quickly? Or, alternatively, could there be a limit on the number of IP addresses that are permitted logins within a certain time period? Perhaps the best scenario would be: if session limit is triggered, and the IP address of the new login is different from before, then enforce a delay before yet another login is permitted?

Thanks for a great, important module!