Dont see much use in the sliding clips on the strap really
The clip is there to restrict where the camera slides along the strap. A taller person might want to move the clip 'down' so the camera hangs lower. I do sometimes move it depending on what's hanging - with a standard zoom and if I'm walking around without kids in tow, I set it higher so the camera hangs at the side of my hip. But with a white zoom or with kids along, I prefer it lower so the camera hangs at the small of my back - a little further to reach, but better balance for the big zoom, and less in the way if I need to grab one of my daughters.