I can see the reasoning behind this 
as the number of words increase, an ability to filter out the ones you don’t want to learn at the moment could be helpful in cutting down review time. We’ll give it some thought 
There’s a back button which allows you to visit the previous question if you accidentally hit a typo and proceeded to the next question too quickly to undo it.
You can view the Back Button announcement here.
In tandem with that, there’s also an Undo button now. So when you go back to the previous item, you can undo your typo answer Here is the doc page that includes information on both the back button and undo button.
Is the above combination what you had in mind?
We could possibly introduce an alternative mode/setting for this. I guess the main reasoning is:
- it’s hard to isolate an answer for. We ideally always want a way to confirm your knowledge of something, whether that be typing something out or drawing the character.
- The best way to answer a question of
English meaning→Chinese characteris an ability draw out the character. Drawing out the character would make reviews significantly slower though
I’m curious how your experiment with English word → Korean word will pane out – Let us know if it ends up working for you
In terms of answering the question, “How do I get words to stick?” it seems the best way is exposure/immersion. Only through exposure and immersion do you grasp the nuance.
For example, in English there’s the word “content” which has many different usages and nuances. Some examples:
- Where are the contents of the box?
- He was content for a split-second.
- Online content of substance may dwindle in the coming decades.
- We had to content ourselves with clam chowder.
I actually forgot that “content” could be a verb, as in the last example 
– suppose it’s due to little exposure of anyone using “content” as a verb nowadays.