Suggestion: Keyframe behaviour tweak to save a lot of time...
When you add first keyframe and set value on it, this value should apply to everything after said keyframe, not the whole video.
How it works now: You have a 100% scale video; You set scale keyframe in the middle of your timeline; Set value to 150%. Result: Whole video will be 150% scale.
My suggestion: You have a 100% scale video; You set scale keyframe in the middle of your timeline; Set value to 150%. Result: First half of the video will be 100% scale, but after that keyframe 150% scale.
This would allow to instantly change value using only 1 keyframe. (You can achieve the same result right now, but you'll need 2 keyframes or slicing)
To sum up, this change doesn't hurt filmmaking process in any way and could save time making some projects.