Something i think that would make a great improvement to actinic is to have images for payment options, at present you can have either a drop down list or radio buttons. we use actinic payments and paypal and to improve the customer experience having logos of visa, MasterCard, etc and paypal logo instead of a drop down list would be a more user friendly experience.
ie http://www.drfoot.co.uk/images/choose_payment.png
ie http://www.drfoot.co.uk/images/choose_payment.png