Love this plugin! I was trying to do something like this with events and it was a huge pain, so I'm glad someone finally made a plugin.
I would recommend either changing how the warnings are handled with messages or adding a parameter for it to be tied to a switch since the warnings currently flash on and then immediately flash off if there's multiple message boxes because they are scripted to turn back on upon message termination. I commented out lines 1416 to 1421 but it means I have to manually turn it back on after the final message box (or open and close the menu or start a battle). Just something I've run into while testing. Great plugin!