So assuming that I did not just miss seeing this in the Wiki, has anyone else found other such working undocumented commands?

Return is used to force a script to stop processing from that line on. It does not JUST terminate the current block, it terminates the script for the rest of the that iteration of the script in that frame, including the blocks below, if any.
If the script uses a block that runs for multiple frames, such as http://cs.elderscrolls.com/index.php/GameMode, the script will be run again in the next frame. Return can be useful inside of http://cs.elderscrolls.com/index.php/If statements by allowing you to prevent the lines following the return from being processed."

Return is used to force a script to stop processing from that line on. It does not JUST terminate the current block, it terminates the script for the rest of the that iteration of the script in that frame, including the blocks below, if any.
If the script uses a block that runs for multiple frames, such as http://cs.elderscrolls.com/index.php/GameMode, the script will be run again in the next frame. Return can be useful inside of http://cs.elderscrolls.com/index.php/If statements by allowing you to prevent the lines following the return from being processed."
