There are numerous ways to "cheat" in NWN2. I actually do it all the time to test modules. First and foremost, you can use the console commands to do all sorts of stuff. You can also create any kind of item you want in the toolset, and save it directly to your override folder, allowing you to spawn it in via the console commands. You can also use a premade leveling module to make your character however you like and then save it off to your local vault for later use. People generally don't upload "god items" to the community, since it is so easy just to make your own. My suggestion is to just make yourself some items in the toolset and save them to your override folder. That way you have complete control over how powerful you want to get. To be frank, however, the official campaigns are so easy that after a little crafting you don't need to use any of the above methods.