I have multiple active rigid bodies which start to animate at frame 1 which is too fast. So to keep them still until the collision I want to keyframe "dynamic = off" at frame 1 and then change it to "dynamic = on" at 1 frame before collision.
However I can't find a way to do it unless I individually click every rigid body and set their keyframes. This is problematic as there are more than 100 rigid bodies and now I am asking if there is a way to set keyframes for all of them at once.