Upon reading many other posts on the frustrations of difficult words, but also my own wishes for how difficult words could work, would it be possible to have a setting where you can decide how Difficult Words will function? Right now, at least from the Android App, you can click on your settings and edit different learning settings. What if under Learning Settings you can edit the behavior of difficult words? It would be something like this with a dropdown menu (a dropdown menu where every integer between 0 and 100 or 200 is available):
Auto-Marked Difficult Words Disappear After ____ Reviews:
1
2
…
Never (So only when you manually remove the difficult mark)
Manually-Marked Difficult Words Disappear After ____ Reviews:
1
2
…
Never