Wow thank you for this review!
Actually the first one is already under development - well, sort of. After you reveal a card, that reveal button will turn into a “show details” button, which will bring up the page with the meaning / reading mnemonics, hints, example sentences etc in an overlay modal. If you pull it up from, say a meaning review, the readings and other parts will come pre-collapsed (to avoid spoiling upcoming reviews). From here, you’ll get that typical “Kanji’s used in this vocab” section where you’ll be able to navigate to the page of the particular kanji in a word. I included a sneak peek of it below from the web version.
The second one is in the roadmap, and for the third one I was thinking of having the ability start “random reviews from your burned items”, but come to think of it, it’s a good idea to have the ability to create “custom lists” where you add subjects in, and then start review sessions from those lists.
These days it’s been crazy busy with work and other stuff, so I couldn’t have much time to work on Juken. I couldn’t even get to @morteasd’s bug report yet 
But hopefully I’ll be back on track soon 
