For 1: Don't know what the code looks like but my initial guess would be something like the AoE targeting indicator is using an out of date list of the enemies to display being targeted, rather than the currently alive enemies.
I think all this stuff runs on Javascript. Half the time I have no idea what I'm doing here. If I showed you the plugin do you think you'd be able to figure out what's going on? you might need to understand Japanese though...
I don't speak Japanese, sorry! I do know javascript. Is the code in the client side of this the same stuff you're working with on your end? I'm not familiar with RPG maker's dev environment at all.
