Intelligent Port Scanning

One concept I have been throwing around with the group is the idea of more intelligent port scanning.  I think it would be great to have a port scanner that could detect an IPS and adjust appropriately. By feeding the tool "previously known open ports", it could have sort of a heartbeat back to the target to detect if there has been a service crash or IPS interference.  Ideally, it could run the check from separate IP addresses to differentiate between the two.  The below file is a simple interactive perl script as a proof of concept to this theory.  As I get more development cycles I would like to expand on this idea.  As opposed to writing a whole new port scanner maybe just create a script to kick off and monitor the tried and true Nmap scanner.

StatefulTCPScanner.pl
Updated Version
IntelliScan0.02.pl