I wrote [Self-Study Quiz] and [Self-Study Hide Info] specifically for this purpose. With both installed, you can go to the level pages and either manually quiz yourself by hiding the English part (or Japanese if you want to do reverse-reviews). Or, click on the Quiz button next to a level’s Radicals, Kanji, or Vocab, and it will quiz you on those.
If you review your levels regularly, it’s not going to interfere with the SRS. Generally, more study is almost always good. It’s only bad if you just “study right before the test” and never any other time.