Allow 100 records for IP's that had access to cpanel (currently limited to 15)

As a web server administrator and account cpanel owner I'd like to have a log of the last 100 IP's that had access to the cpanel interface, also known as "Last Login IP Address" which are currently limited to 15 records stored in the hidden file: /home/useraccount/.lastlogin where the last one is displayed in the main cpanel interface > right column > general Information.

This file currently stores in simple text: IP, Date and Hour, which is good, but 15 records is not nearly enough and I don't understand why this is so limited since this helps in a security audit and surveillance which nowadays is crucial.