Not sure if it exists but one suggestion is to take already known words into account when creating a new vocab helper. I recently added a vocab helper adding only 1 word per pronunciation and for 子, the word 電子 was added despite the fact that I already know お菓子.
Would be nice if it didn't add new words for pronunciations you have learned in other schedules and instead prioritized vocab you already know. Or at least a setting you could toggle for this feature
This definitely sounds like something that could be added. The settings panel is already pretty long, and I'd like to open up to all users soon, but this might be good as a "version 1.1" update.