I have this same issue and have a follow up to your answer…
When you say:
You can do vrtually the same thing wihout lifting the clip if you use the precision editor on a clip that’s positioned between two others.
How do I use the precision editor to extend the keyframe beyond the clip? When I go into the precision editor, I can’t see the keyframes at all (which I usually do by pressing ctrl-v). How do you manipulate the keyframes in the precision editor?
Thx.