I don’t know if I’m the only person who feels this way, but the % correct up in the corner is a great motivator for me. If I dip below 95% I usually slow down and if I go into the 90-94% range I really try to think carefully before answering so I can raise it back up.
On the same sort of note, I’d love to see WaniKani count your correct streaks as well to see how long you can chain/combo correct answers.
I see that someone had a similar thought quite awhile ago, but it didn’t get that much traction: Is there a streak plugin?
Maybe there’s more support out there now?