Can the surcharges / discounts additional costs also be displayed in the e-mail confirmation?

Yes, the following code must be inserted in the email template (preferably directly above the shipping costs)

{% set collectedSurchargeDiscountAdditionalCost = null %}
{% if order is not empty and order.customFields is not empty %}
	{% if order.customFields.acrisSurchargeDiscountAdditionalCosts is defined %}
		{% if order.customFields.acrisSurchargeDiscountAdditionalCosts is not empty and order.customFields.acrisSurchargeDiscountAdditionalCosts|length > 0 %}
			{% set collectedSurchargeDiscountAdditionalCost = order.customFields.acrisSurchargeDiscountAdditionalCosts %}
		{% endif %}
	{% endif %}
{% endif %}
{% if collectedSurchargeDiscountAdditionalCost is not empty %}
	{% for surchargeDiscount in collectedSurchargeDiscountAdditionalCost %}
		{{ surchargeDiscount.label|sw_sanitize }}: {{ surchargeDiscount.price.totalPrice|currency(order.currency.isoCode) }}
	{% endfor %}
{% endif %}

{% for shippingCost in order.deliveries %}
    Shipping costs: {{ shippingCost.shippingCosts.totalPrice|currency(currencyIsoCode) }}

{% endfor %}