For example one account has a 30 trim IP adreses from different cities or even countries. It's certainly suspicious.

Often this is due to the fact that they are buying something in the clubbing, as well as for counterfeit use - resale, or putting some on a torrent.

Can you make a addition to the plugin that will track the number of IP values, and block access if it starts some sort of a suspicious activity?

For example:
Simultaneous input from different IP
Access from two different IP from different cities (if from one city, then maybe it's work and home computer)
Or more than three different IP all the time.

something like this …