Well, it's cute if you're on a LAN @ your office and some lame within your subnet is shooting off scans(bad idea) with some point & shoot tool and thinks he's el ill haXor MC. OR, maybe even if your box @ home is bucked naked on the wire to the world and you need some blind bulldog insurance.
BUT, lets hope badguy is not using a proxy or 2 or a anaesthetized zombie host and lets hope he's just a kiddie and doesn't even know what OSI means or the inner gutts of a tcp packet or ip datagram look like, or how to forge them, let alone the difference between syn or ack. Yo man!
That might suck! Otherwise, like, it's casual... Fire it up man I'm feeling lucky!!
I'm joking. Some protection is better than none. Can't go down without a fight I guess. Just doesn't seem very safe firing off in the dark like that you know? Well, at least don't ever close your eyes before pulling the trigger.
I can see this utility being more usefull with more development. Perhaps a future release will have more to offer?
Eh, maybe I'm just being picky.
Keep it up. Keep it locked.