I like the concept and I hope this plugin works so that I can achieve the effect that I want. However, the plugin doesn't seem to adhere to the settings configured.
I set the amount to $4.50 and the Minimum Order to be $80.00.
When the order total was under $75, there was no additional fee. When the order was $75, there was an additional fee. It was the same when the order was $100. When the order was increased to $125, the additional fee option disappears.
When I add an addition item to the cart, the additional fee goes onto a row of it's own. And then, the additional fee becomes added to the cart regardless of the order amount.
I like the concept and I hope that this plugin can work for me.