I was wondering if there's any way to do a custom review. For example, of the 94 cards I've learned so far, I'd like to be able to sit down and just go through all 94 of them. I wouldn't do this on a frequent basis, only so often to monitor how well I've learned the kanji so far. I haven't been able to find this functionality on koohii, is it possible?

There is a tool to review a range of Kanjis here: http://kanji.koohii.com/labs. Hope this helps.

Exactly what I was looking for, riogray! ありがとうございます！ ＾＿＾