Custom fields add price without tax

[Kuubs]

Hello,

I've got a weird interaction, but maybe it's more of a user friendly method of input. I ahve a couple of custom fields which add prices to the product, but at the moment you have to calculate the price without tax so the total price is correct. Instead of without tax I'd like to add the final price to the custom field so it's more user friendly to work with.

At the moment I have to calculate the price without tax and use that to make it correct. Is it possible to change this (maybe this is already possible?) so the admins of the webshop have a more easy time instead of calculating everything by hand.