Yeah it's true. The eye-patch is something we slipped in for the 1.05 patch I recall. It did get "properly" cracked about a week later but we had our fun moments. :)
The crack detection didn't do anything evil (like sending over the user's email or IP address details :-) and didn't degrade gameplay in any way. You just got the eye-patch and a loading screen tip encouraging the user to buy the game.