Please dont worry about asking too much questions! I welcome them!!
At the moment, no there is no plugin command that can do that. You'll have to manually add the monster but it is VERY easy to do as the monsters are basically the actors so you can add/remove them with rpg maker mz's vanilla settings! For the UI, yes you can change the window and yes you can change the colors but you'll have to play around with the code itself if you want to change things as its not available as a plugin parameter.
And lastly, yes!! In the recent updates, I have added animated battlers for the monsters, so yes it supports idle animations!