[Albert]

This feature already exists. You can mirror programs and objects by using the Scale function. You can try it like this:

1. SelectTools-Run Script
   
2. SelectScaleXYZ
   
3. Choose the program or object you want to scale.
   
4. Enter a per axis scale.
   

You can enter the value -1 to mirror along a certain axis. You can also customize the behavior of this script using the API.