Ive played the BKB and reconquista Mods on MTW and am currently playing the Mapus Mundi XGM mod for RTW.I much prefer the mods to the vanilla games because of the increased historical accuracy in starting positions and army composition.To be fair however it did take me a long time to get bored by the original games.im not a modder myself apart from the stuff you can do easily like changing the name of the east romans to byzantines which is hardly modding.
The K of W