This proposal is for a new feature in Wiktionary.
A person in a process of learning a new language may wants to create wordlists to memorize his/her acquisitions, and then organize the lists by themes (animals, plants), functional categories (emotional verbs, action verbs, nouns) or whatsoever (sound similarities, words learned in week 1, etc.).
Wiktionaries offer a great amount of content for language learners but do not provide any tool for this need and people use instead other websites, or do this task by hand. This task may drive those people to become contributors by discovering words not described and they may create new pedagogical content that can be host by Wikibooks.
We can imagine options to easily edit the Custom List such as:
* a field to add a word in a category
* an option to delete a word without editing the whole page
* a rapid way to reorder sections and words
This tool may be included in Wiktionary or be apart, in a lighter interface, to share the lists. It had to be accessible to non-registred users.