Ability for the mirrors or lenses to move with some velocity

[NotCarlFriedrichGauss]

No description provided.

[ricktu288]

To move one object, simply select it and hold an arrow key.
To move several objects together, bind them to a handle (see the "Group, rotate, and scale objects" section in the Help button at the lower right corner of the app), click the handle and hold an arrow key.

In the future, custom animation may be added to the "module" feature of the app (see Tools -> Other -> Import Modules).