You should use the scripting forum. I only hack at Photoshop scripting when I need to. What I put together is usually made from code I find on the web and modify to do what I want to do. When it come down to it I really don't know javascript. I have a programming background but most of mine was was in design, debugging, and developing programming development tools. I retired back in 2002. I never got into Object orientated programming though it was in full swing as was C programming along with java. Microsoft had given up on its object orientate desktop OS2 system sidetracking IBM with it.
I did not look closely at your code. That something you should do.
In the scripting forum you will get better help then I can give you. Many of the better scriptwriter seem to have left there becase of frustration with Adobe support. However there are some that still visit there regularly.
You may want to look into Xtools there open source and the author still visits the forum from time to time. I have use some of his scripts but have never gotten into his library I'm retired I only play a little to keep some brain function. ps-scripts - Browse /xtools at SourceForge.net