The plugin doesn't change the behavior of when to show a damage pop up, rather, it just changes how it looks. As far as I know, you can only set one element for a skill in the database > skills > damage > element. This is what the plugin uses to change the looks of the damage sprite. If you are using a plugin that allows for concurrent actions and display multiple sprite damages at the same time, then the corresponding looks should be applied to each, provided they're compatible.