The site is fine as it is for me, but some small change WOULD be great. The site feels kinda stagnant.
More board skins, perhaps? Something modern.
Maybe something like http://github.com/bainpo/weabot ?
The repos haven't been updated in a year, though.
From what I checked, it can archive inactive threads (like 2ch does) or old threads (like Futaba), IDs change every 24 hours (like 2ch), automatic noko for textboards (like 2ch), it can make both imageboards and textboards, autorefresh for the textboards, a dynamic home, oekaki (PaintBBS, Tegaki, wPaint, shiPainter), etc. I'm probably missing some things, and I've got no idea if these are part of the github release.
Site can be improved by deleting it
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make the post numbers by board instead of thread so there can be gets