3d object strip and collection strip in VSE for motion design

1- Strip referencing an object or a collection: That object or collection is visible&render in scene when the sequencer timeline cursor is over the strip.

2- Strip for 3d camera for switching camera in active scene: Actually switching camera is done through timeline markers (and it's not fun) or through scene strip while a single camera can be used in many 3d scenes for transition for example.

3- Strip for 3d text or text strip to 3d text