Had a few minutes, so here's a really simple layer toggle script Create an action to load the script, bind to hotkey, and you're good to go. If I have time later, I'll add a bit to have it show up properly in the File->Scripts menu if you've got the script in your presets/scripts folder.
Yeah, it takes a bit of tweaking to get it to work but there are a few things you can do. I was actually thinking of writing a few things about that. The hardcore way would be to write .JSX scripts performing the commands you want. Once they are put in the proper Presets folder, they show up at the bottom of the file menu…