Hello Robert,
I hope you are well today.
We regret to inform you that, at this moment, radio buttons cannot be used to add fees. You can only add a fee for the cart total using the Field #1 > Fee Options section. However, I have passed your request to our development team. They will check the viability of this and get back to you as soon as they can.
Regarding the layout issue, please paste the following CSS in your child theme’s style.css file and see if the issue persists:
.woocommerce form .form-row label.radio,
.woocommerce-page form .form-row label.radio {
display: inline-block
}
If you have any other questions or need assistance, then please let us know.
Kind regards,
Moshtafizur