It should be possible to split Compositors to avoid some tricky situations.
For eg. if I have to split a clip and I want to keep the keyframes of the second part of the composition: I have to create a second composition before to resize the original one to avoid losing the keyframes. Make it long as the part of the clip I want to cover. Copy the keyframes by setting the in point where I’ll apply the cut. I’ve to reduce the original compositon to the length I need. I’ve to split the clip and move the created compositor on it.
The3 point editing is totally incompatible with the compositors if they are not splittable: they are always completely removed from the timeline when you lift/Overwrite Insert/Extract a part of a clip.