For products in our catalog, we want the ability to add a batch process that is only priced once, regardless of product quantity. I have everything almost working, all that I'm missing now is how to add that cost to the extended amount in the quote product. If possible, I'd like to avoid replacing the entire system-wide price calculation with a custom plugin which seems to be the only solution I've found so far. However, if that is the only route, is the plugin required to replace every price calculation in the system, or can I set it to only trigger for quote products and will it default back to the stock calculation for other entities?