Renshuu.org - Study Japanese Online

There might already be a feature like this somewhere in the settings and I just haven't seen it...  

I find it really hard to read some of the words in example sentences and quizzes and such when it shows half the word in kanji and the other half in hiragana. For example, just now there was a sentence that read: このそう音は耐えがたい。 It took me a few seconds to realize that it wasn't そう　おと but そうおん - I was trying to wrap my head around what そうおと could possibly mean  

So, would it be/ is it possible to set unstudied kanji to show as kanji and not hiragana when part of a kanji compound without simply marking all kanji as studied?

Not a feature yet, but...hmm..I will consider it for a future addon.

I was fiddling with this yesterday and realized that even though all N2 kanji were marked as studied, for some reason N3 weren't... If you choose your JLPT level to be N2 in the prviously studied settings, shouldn't it automatically mark all levels before that as studied as well?

What do you mean when you say 'marked as studied', and can you give me an example?

Just the kanji study history settings. Although I had marked my JLPT level as N2, and so automatically a lot of kanji, N5, N4, and N2 were marked as "known" but it skipped N3 for some reason. Did I misunderstand how that setting works?

No, doesn't sound right . Give me a few kanji to check out for you.

I manually marked them all as known, and that was 9/10 of them, including: 泳　腹　恐

I'm terribly sorry for letting this issue slip through the cracks. Are you still having this problem? If so, are there any remaining N3 kanji that a)aren't marked as known, and b)you haven't yet manually marked them? (If you mark them, I will not be able to backtrack and try to replicate the issue).