UploadWizard was written mainly for Wikimedia Commons and while it is possible to use it on third-party wikis, its usability is somewhat restricted by lacking configuration, documentation and hard-coded Commons-specific features.
This task is a (mostly) subjective tracking list of third-party wishes. You are welcome to create subtasks and suggest new improvements to UW. A lot of this is based on [[https://gitlab.com/nonsensopedia/extension-forks/uploadwizard-nonsa | Nonsensopedia's fork of UW]].
The list is most definitely not complete.
[x] {T228579}
[] {T228771}
[] {T228701} (requires T228771)
[] Verify that it is possible and document adding new fields to the default upload form (no campaigns)
[] Allow disabling of the multi-language description feature on single-language wikis (very annoying and bloaty)
[] {T262252} (it's hardcoded now)
[] Figure out a way to add custom licences to UW and load their messages properly through ResourceLoader
[] Make the heading field in location widget hideable through configuration
[] Make the Location template syntax somewhat configurable
[] Allow (or document how to do this if it is possible) disabling of adding a tracking category to campaign-uploaded files
[] Make the `{{own}}` syntax configurable
[] Localize the default `[[User:...]]` link in the `author=` field – [[https://gerrit.wikimedia.org/r/c/mediawiki/extensions/UploadWizard/+/625850|see the patch]]
[] Make all kinds of Information-related syntax configurable
[] Make file description headers configurable
[] Allow external JS to hook into the categoriesWidget and modify it, for example with a custom input filter
[] Allow making date, source and author fields optional
[] Parse some label messages to allow for formatted text