@revi, I almost pulled this to our main workboard, but I realized that we still need a list of "informals". @Ladsgroup said that he's updated https://meta.wikimedia.org/wiki/Research:Revision_scoring_as_a_service/Word_lists/ko with a new run of BWDS. Could you have a look at it to see if it is any more useful.
Alternatively, you could help us build a list of informals from your own knowledge. See the English informals for a large set of examples of the kind of thing we're looking for. https://github.com/wiki-ai/revscoring/blob/master/revscoring/languages/tests/test_english.py#L87