Control and Ctrl are the same key, which is just Ctrl but they were written in full English (which is used by default RPG Maker) and shortcut. It's not Control left button or Control right button.  To make it easier to understand, both are just Ctrl button.

I think I figured it out. The key is matching with Ctrl but in the plugins help file it refers to the button as "Control". If I just change "Control" in the plugin parameters to "Ctrl" it appears to be working right again. Alternatively, I can just change 'ctrl' to 'control' on line 256 of your plugin and it will use the correct symbol/key used in the plugin's help file. I appreciate your quick response(s)!