The expressions simply check the velocity of your animations. If you move an objects motion ends abruptly (ie: you didn't easeIn @ 100%) the physics will kick in automatically.

Sliders hooked up to provide easy rotation looping.

Docucam is an After Effects preset loosely based on the excellent Docucam in CS Tools for C4D. The preset simulates handheld camera moves and more

It shouldn't matter what rotation methods and parenting the original camera has, as it translates all of that into a free camera with only position, rotation, and zoom parameters.

Exports the selected layers and cameras within the work area to Maya, 3ds Max, or Lightwave.

This script creates one new layer for each selected layer in the active comp. Each layer contains an arrow that gives velocity feedback.

The random(x) expression is simple enough to randomly rotate a layer to any angle, but what if you want that angle to be to the nearest 45 degrees?

This expression creates a flickering effect on a layer - similar to a flickering neon light.

Essentially, Inertial Bounce creates a bouncing motion of any parameter from one keyframe to the next, based on its velocity.

Here is a short script to convert a 3d layer's orientation values to rotation values.