Phatch looks like a good piece, but the most important thing for digital pictures is the correction of distortions, like pincushion. For the w-world there is an application called fixfoto with features I am missing in Phatch:
- define and setup of lens profiles
- distortion correction based on those profiles
Article titled Hugin developer launches photographic distortion correction database links to Fulla project.
Its a CLI tool and it could be called from Phatch as a plugin.
Actually I met the Hugin developer. I showed him Phatch and he wrote already an action plugin for Phatch with my help. You should ask him to make it publicly available. There was still a speed issue but it works fully.