This is a page for requesting work to be done by a bot. This is an appropriate place to simply put ideas for bots. However be aware of various tools available to all users which can be used to accomplish the work without the need for a bot:
Gadget Cat-a-lot can be used for most category adding, removing and moving
VisualFileChange tool can be used for mass-changes of one author's uploaded files, or files in a category, creating a mass-deletion-request, let you insert tags to the file-description-pages (even copy from exif/meta-data). You can also perform find and replace operations with or without JavaScript regular expressions (regexp). A common use case is: "I've changed my username". It's a web-tool and can be launched directly.
AutoWikiBrowser can be used for large number of supervised and automatic edits
