yes there are many programs available
like Xport 360
Yes especially online modding.
you get banned by modding credits instead of earning them yourself
you need capture card or a special modding program
I've seen someone play the campaign as a jackal by modding their game.
OK first that first answer was someone who NEVER! played HALO (WHICH IS AWSOME BY THE WAY!!!) you can't drive one in halo without modding. BUT maybe in Halo Reach you can >: )
no because bungie disabled offline to online transitions with credits and armors and modding your credits will count as offline credit gaining
I wouldn't recommend it. Bungie have an automated program that checks all activity online and you can be punished by having your account banned from matchmaking, have a full credit/armour reset or in extreme circumstances you can be banned from xbox live.
You get banned for modding anything dealing with an Xbox
I take it you mean the GPD file for modding. The name of the Halo: Reach .GPD file is 4D53085B.gpd Message me over Xbox LIVE if you want a modded GPD file. GT: The 3rd Arc
If it is on the PC, you can only do that by modding.
well, it's a mod so if you know how to mod then look it up on youtube or something
Your pre-order? Just return your pre-order and buy the other. You must have valid verification that you are the buyer and have a receipt from the reg pre-order. If you mean by modding the game, then not really.