Hi Olly
The option to show Attribute Price only appears after you've set 'Ignore Product Attributes' to 'No'.
PAPs has always been meant as an addition to - not replacement for - any default osCommerce functionality. So yes, you need to set up all product attributes for the product before uploading attribute related images with PAPs.
I understand you have a lot of attributes to set up for a lot of products. People often use a contribution such as Easy Populate to help them achieve this . You can find it here:
www.oscommerce.com/community/contributions,500 Regards
Nick