This can be either an individual WaniKani level or a range (e.g. 5-7).

This can either be an integer, to drill exactly that many kanji (with repeats as necessary); or xN, to drill each of your selected kanji N times.

In automatic mode, a correct answer will be accepted as soon as it's your IME's first suggestion, without you having to hit Enter (or indeed finish composing the character); this is great if you're trying to go really fast, but can be a little jarring at first.

Leave blank to disable auto-advance. Be advised that combining both lightning modes (ASAP acceptance plus very low auto-advance) may result in inadvertent initial strokes, though some pains have been taken to mitigate this.