WP Multiple Login Tracker Idea

Is it possible to log specific data for each individual user that has signed in and send an email to the admin if multiple people are using the same login?

Could a variable threshold be set? Something like after a single user logs in from 5 or more IP addresses that throws up a flag.

Email sent could show the last few entires with other info like time, browser, etc. so an admin could decide whether to disable that user?

This would be helpful for preventing shared logins on subscription sites.

Is this at all doable? Would anyone be interested in getting together to try it?