Yeah after combing through forums for a few months I stumbled across a method for decompressing them and it was pretty easy from there. I'm currently in the process of recording some tuts will post links when they're up.
As far as documentation goes I've never added to wikis before but will see what I can do. Your help would be greatly appreciated. Thanks.
Also in response to Dio's question. I've edited all the trainer teams (including shadow pokemon), all the TMs, added some moves from gens 4-6 (like scald and dracometeor), edited some pokemon stats, level up moves and abilities (like giving the blaziken line access to speed boost and huge power on azumarill), edited the starting moves of espeon and umbreon. In general I made the game more challenging. Colo was one of the hardest pokemon games as far as they go but was still easy enough if you knew what you were doing. My version has trainers with more competitive teams and I threw in all my favourite pokemon as shadow pokemon so it's a lot of fun. Oh, and I also changed every occurrence of the word 'Snag' to 'Swag' just for the banter =D.