It has been a while since I had the opportunity to mod anything at all. I found a nifty tool for Borderlands 2 that will allow you to modify your game saves in the same fashion that Willowtree did for Borderlands 1. The Program is called Gibbeds Borderlands 2 Game Save Editor made by an individual named Rick. All credit goes to him for creating the program naturally, and his site can be found here: http://blog.gib.me/ . This program works for PC, PS3, and XBox 360 game saves.
The program can convert PC saves to 360 saves and vice versa. I am unsure aobut PS3 saves. This program allows you to mod weapons, Money, Stats, etc. Gearbox has caught onto the program however, and with the newly released 1.30 patch for Sir Hammerlock hunt DLC, you can't have anymore than a total of 45 skills points. Any additional ones previously added that were not used are removed upon loading the gamesave. Also, items that are modded with a White (Pre-Pearlescent White), Black, or Red Rarity are removed upon your inventory upon saving and quitting, so modded guns with such raritys have to be banked or Claptrap Stashed before quitting, or they will not 'stick'. Also guns with the wrong manufactuer or wrong body will revert back upon loading the gamesave, completely resetting the modded weapon.
Outside of that, this program is very fun to use, and is resourceful to use for the game's orange rarity weapons that have a 1% or less drop rate (For example the Vladof Infinity from Doc Mercy), especially if you have friends that don't like to duplicate their gear for you, telling you to earn your own. You can build items from scratch as well, so you don't necessarily need the BL2 Code, altough having a couple of items from a gamesave is helpful. I'll add the program to this post.
Useful links for this program:
All Parts and Phrases for Items Sheet: https://docs.google.com/spreadsheet/pub?key=0ArIrXCpgI-vFdDB5Q1gwZ0JPRGgyMTNTQnVMS2hPWlE&gid=0