Anime Studio Pro script
Download Loop Switch script ver.1.2.
Installation: Just put it in your scripts/menu/other folder.
Usage: Select a Switch layer and run the script.
The switches in the layer will then be layed out in the timeline following their layer order.
The parameters you can set is start and end frame in the range, interval between the keyframes,
and you can also select to lay out the keyframes in reverse, starting with the last switch, going downards in the list.
If the switches reaches the last one before the range has reached it’s end they will start over from the beginning.
Updated, you can now also set to use every # image in the sequence. Setting it to 3 for instance would use images 1,4,7,10 etc.