I released a "realism" mod awhile back. It's more of a balance mod though (hence the name, Noctis Balance Mod, or NBM). I released it back when I was running a couple of servers, including the pureservers.com server, which never even once (except for downtime from the server host once) dropped below 16 players. Not even at 5am, OC48gaming can confirm this.
Anyway, the mod was immensely popular with everyone who played it, but I got busy and had to shut my server down and never really promoted it after the initial release. You'll find that it balances the game pretty well, eliminating a majority of the flaws found in CKR in regards to MG whoring, etc.
Anyway, here it is and enjoy yourselves kiddies.
http://www.movv.com/files/other/user-NBM.zip