Allow customisable 'kanji per lesson'
I use a Anki deck to learn kanji in the KKLC order (thank you for adding that option!), and I use Ringotan to reinforce the kanji I have learned.
It would be useful to be able to customise the number of kanji per 'lesson', so that I can match the new cards of the Anki deck (e.g. 10 new Anki cards per day = 10 new kanji in a Ringotan lesson). I know a lot of people set their new card rate in Anki to 5, 10, or 20 per day.
I'm aware that I could do a 'normal' lesson size of 9 kanji, then add a tenth using a custom review. Or I could change my Anki deck so the new cards match Ringotan, rather than the other way around. But just an idea.