Download WidgetLocker... Go through the set up process, IE make it default Home and turn off the system lock screen and it works great. It allows you add widgets to your lock screen and modify what your bar does, and many other things.
Mainly, it allows you to specifically turn off the haptic feedback for the unlock swipe. I just double checked and it is very easy to do with this program.
Bonus: It also doesn't lag at all while unlocking!