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Maybe try to just click the lock (just to the left of the timeline) on the tracks you don't want to move. Unlock tracks when done with your duration change.
Jeff
That's technique is good for layers other than the active layer. I have used that technique before when I wasn't concerned about the active layer being changed. But when the relative position of all layers need to be static relative to each other, it doesn't work. What has worked is to lock the other layers, calculate the total difference in time to the objects being expanded/contracted and then after the adjustment, move the remaining objects to the left or right by that difference. It can be a pain.
When the adjustment might effect the positioning of other objects in any layer, I would prefer a popup that gives an option (similar to Cut and Remove) to adjust: all layers, this layer only, or no adjustment. After all this is no different than Cut, Remove or Insert.
Paul C