You can use [Userscript] Self-Study Quiz combined with [Userscript] WaniKani Open Framework Additional Filters (Recent Lessons, Leech Training, Related Items, and more), this let’s you quiz Items outside of the SRS to make sure you remember them.
I actually like it the way it is, mainly because of those instant regret wrong answer. (When you press enter and as soon as that red bar flashes you remember the correct answer)
I think it would bother me if I had to wait another 100 reviews to answer it.
Also, there’s those Items that I just simply forgot. I like getting those out of my review queue faster because I just want to move on with my session and spend some time practicing them later.
Not saying this has to be true for you, but I guess it’s just one of those things that you can’t make so it suits everyone.