IN OUT points setting into the History undo/redo list
When you are in the rush you can hit the wrong key on the keyboard. And as I and O, to set IN and Out point, are one on the side of the other, this can happen more than one time during the job.
As you can imagine for eg, if I locate and set, the In point and then I seek for the Out but I hit for a mistake again the I instead of the O I have to restart the seek job from scratch.
This is why all the applications have the In and Out points settings in the undo list, and I have to admit that when I'm editing I use the IN-OUT undo several times during the job and I feel that this is a very important feature.