Another Retreat: go upstream the history for the next interval at lapse<10kB. Updated 2017-08-26. Supports both Anki 2.0.x and 2.1.x.
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To download this add-on, please copy and paste the following code into the desktop program:
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I recall reading something recently that essentially said (paraphrasing) "difficult recall is desirable" because it improves retention. Another Retreat may be accomplishing that by improving the chances that the next recall will be more difficult compared to the default lapse behavior.
P.S. I would be in favor of Damien doing some fine-tuning of Anki's scheduler or at least optimizing the default settings in the next major version. Maybe incorporating this add-on to Anki's code would be one way to accomplish that. I don't know if there's strong evidence out there for improving the memory model (and I have no idea how evidence-based the newer SM algorithms are), but I'm in favor of Anki making more progress in this area.
However, I would caution: It did not work for Anki 2.1 with v2 experimental scheduler.
I switched to Anki 2.0 recently so that I could use load balancer (that also did not work for me on Anki 2.1 with v2 experimental scheduler). Another Retreat works perfected on Anki 2.0, therefore I am sticking with this set-up for now.
This addon is really good. It removes the need for reviews at a time when they don't help much with remembering. This addon lowered my study time quite a bit, but it did not worsen my ability to recall cards. In addition to that, when I did not understand something about the mod, the author explained it to me in a very friendly way. I really want to thank the author for making this.