I am slightly inconvenienced by making an icon for comic episodes, however, what would truly make it easier is if the Tapastic website was able to let you choose an icon from an upload page in the episode (much like the sharing thumbnail) or let you upload your own image.
Being frank, I'm not sure if I understand the difference between using your Crop and Share or just using photoshop to achieve the same thing (with better image quality). ?
Glad it works for you though, and great job coding and making Crop And Share, but until Tapastic incorporates it into the website, I'll just stick to cropping in photoshop. 