To be honest, if it's not on there, there probably isn't much more to know.
The fact that they follow the Codex closely tells you a lot about their organisation, read about what the Codex preaches.
I imagine the only real significant feature of the Chapter is that half of them are Veterans, because of their low numbers.
Other stuff, you could probably read that in the background section.
Also, they basically ARE Imperial Fists, the Chapter split into parts since they had so many (and adopted the Codex), the Imperial Fists, the Crimson Fists, and the Black Templar.
They have slight cultural differences, but I imagine a hell of a lot of their mentality is identical.
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