First off, I just want to say thank you for all of your feedback. A lot of thought has been put into this project and it is great to hear that someone has found a use for it. We have had some really great ideas for the generator and how it could benefit our workflow.
Here are a couple of features we intend to roll out:
Copy master files - to copy a master file with a different size
Backup image prompt - to prompt the user if there isn't a backup image
Individual banner zipping - preparing each banner in a zip ready to upload to an ad platform or send to a publisher
Timeline scrubbing - with controls to navigate to a point in the animation timeline
Timeline video overlay - for comparing animations with a semi-transparent video
Spritesheet generation - automatically creating spritesheets from a folder of images
If you have any ideas feel free to add feature requests on the repo.