I'm using v21.04.2 on WIndows 10.
Sometimes I use the copy keyframes a lot. When I do the fine tuning and fix one frame usually I have to copy all changes to another frame. It's a pain to click through all the boxes each time. It would be great if there's a button to toggle all selections:

Hmm, couldn't you just copy the entire effect?

berndmj wrote:Hmm, couldn't you just copy the entire effect?

not in this case.
For example, using many keyframes in the Transform effect to move a clip... there are always a pair of keyfreames with exactly the same parameters (to temporarily stop the transformation).
In fine tuning, whenever values are changed in one keyframe they have to change in the next keyframe too to ensure transformation stopped between these two frames.
Unfortunately, in fine tuning the values are going back and forward many times.

No doubt, the copy feature is great. Before discovering it I had to copy each value by typing it manually