I was gonna use this plugin for certain moments in the game where I'd like the choice window to look different, however when I installed this plugin ALL the choice windows in my game were set to their default background when some were either dimmed or transparent.

Is this a bug or an oversight?

Did you download the setup demo? Is the result not looking like the screenshots, or are you having some other issue? And have you tried testing the plugin in a blank project yet?

I tested it on both the demo project and on a blank project and it's the same thing, it seems to always default to ID 1 when it comes to choices. I turned off the plugin and the dim and transparent effects worked again. 

Oh, I'll be fixing the default choice background opacity very soon.

I just uploaded a new version with the fix and some cool new features included.

I think everything works properly now, much appreciated!