For reference, the way to put in furigana in the cs2 engine is: [猫/ねこ]. Luckily for me, there were tools for the engine that I was using (http://www.doddlercon.com/main/?p=120). I used Doddler's Kamikaze tools in combination with GARbro (https://github.com/morkt/GARbro) (used to put everything...