Could you perhaps think about managing djvu files too? It would be perhaps useful for wikisource projects.
At the moment this work is very focussed on making derivative alterations to image files only. We're not working on, and it is not aimed at being, a "Photoshop in the sky" for altering broken images to be fixed with a replacement, but more to provide secondary versions (e.g. a portrait cropped out of a larger image, or an adjusted example of re-colouration.
In particular, non-image formats (like videos or audio files) and extended-image formats (like DjVu or animated images) are not something we're going to work on. A different tool for your purposes could be built, but I don't think this is going to be the right one for what I imagine Wikisourcerers would want.
J.
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James D. Forrester Lead Product Manager, Editing Wikimedia Foundation, Inc.