Problem I often come across is making an animation and discovering it needs a timing adjustment. Things happen too fast or too slow. I want to select all the motion layer keys rescale them as needed. Sometimes it can be 20 to 30 keys and dragging them one by one and hoping it will have the same timing is impossible. I can't make it into an iMotion and scale it because I might want to delete a body part key or move one body part further ahead or back.

The selected keys play too slow so I want to scale them all at once.
Can't find it the manual.
Please someone show me how I can do this.