I was referring to a userscript called WaniKani Lesson Filter
It allows you change which lessons you learn if you want. For example, I use it to do 20 lessons at a time instead of only 5, as well as to specify how many radicals/kanji I wish to include in those 20 instead of them being all vocabulary like they might be by default, for example. It will always keep WaniKani’s intended lesson order, which is very nice!