Minor, and this is a borderline feature/bug, but a number of functions don't work with Extension A or the CJK radicals block (possibly some other ranges too). Magnify doesn't work, nor does searching by character - all I've tried so far. I know characters not encoded in ZYSong may not be officially supported, and definitely weren't tested, so I'm not surprised.
I almost threw this in the features thread, but I went back and checked 1.0. It works there, so technically it's a regression, as characters in those odd blocks work in older version of the radical dictionary I created. I imagine this may also relate to the xml export problem I saw earlier.
Here are some of the characters, not sure which ranges will be supported by phpbb, so just sticking in a bunch:
龺, ⻗, ⻏, ⻎, ⻍, ⻊, ⺁