Yes, it does not ruin the trigger pull. But trigger pull can be different on any out-of-the-box Kimber. My Eclipse II came with a very crisp 4.0lbs trigger and now is down to 3.5lbs (still crisp) after 500rds. I actually stripped the frame and the only part additional is a firing pin block on the inside right of the frame connected by the sear pin that works much like a disconnector. In fact you'll see it next to the disconnector end tip on a Kimber II frame. When you depress the grip safety it pushes itself in the recess, hence deactivating it...
------------------ "That's all we expect of man, this side the grave: his good is - knowing he is bad"
I did not care for the pull on my Custom Eclipse II so I tore it down and stoned the hammer and sear. Cleaned up very well and it is nice and crispy now. As stated the "II" mods should not affect trigger pull.
One thing the "II" safety CAN do is cause you not to depress the grip safety fully due to the increased spring pressure working against it. Granted it takes a "bad" grip to make this happen, but a marginal hand grip without the "II" might go bang while one with it might not.
Hope I explained myself OK.