Problem: In dictionaries, words are normally displayed in alphabetical order. In wiktionaries, when a category is displayed, only a part of words of the category are displayed in alphabetical order, those in subcategories are not displayed. It is often useful to see all words of the category.
Who would benefit: Everyone using categories.
Proposed solution: When displaying a category, add a button to be used when the user wants all words, including words in subcategories (and subsubcategories, etc.)