Use this script to trim all selected layers with the duration you specified, you can also specify the gab you want between the layers ( in frames ).

This script will allow you to select one or more layers and create a solid, choose the color and place it directly below the footage layer and it will trim the in and out points of the new solid to match the footage duration.

Jumps and plays from a random point in your footage every half second.

This script gives the ability to make your own custom toolbar with Effects, presets or any commands you use the most often