So I love SR3 but one of my main complaints is the 2 person Co-op limitation. I was wondering if one of you fantastic people could make a mod that would allow more than 2 people to connect to a game. Thanks in advance 

I'm just going to go ahead and say, no, this is not possible. At least no where close to the same capacity as the current 2 player co-op works.
Speaking of co-op, I was wondering if anyone could explain to me why local/couch co-op was never implemented into the game? This is a feature I would of, pardon my lack of better reaction, shit my pants over. I know plenty of people that would of killed to see this feature.
Edit: Could the admins possibly move this to its own thread or delete this post so I can start said thread? I just realized this isn't really the right place for this question.
How plausible would a 2+ player free mode (akin to GTA4) be if you were forced to play as NPC meshes rather than your custom Boss? I seem to recall reading that's part of the problem with extending the amount of playable characters, as there isn't enough memory to load more than 2 customized characters.
Speaking of co-op, I was wondering if anyone could explain to me why local/couch co-op was never implemented into the game? This is a feature I would of, pardon my lack of better reaction, shit my pants over. I know plenty of people that would of killed to see this feature.
How plausible would a 2+ player free mode (akin to GTA4) be if you were forced to play as NPC meshes rather than your custom Boss? I seem to recall reading that's part of the problem with extending the amount of playable characters, as there isn't enough memory to load more than 2 customized characters.
Hooooooooooooly SHiiiiiiiiiiiiiiiiiiiiiiiiiit! I now am in love with Volition! Thank you fo taking time out of your busy schedule to write a short essay explaining everything.The generic short answer:
As a general rule when designing games (or anything really), you need to utilize limited resources in an effort to make the game you want to make the best it can be. For any feature, you must compare it's cost with it's benefit, and decide if it's a good fit. The cost of any feature X can be broken down into the actual cost for labor to implement the feature (man hours), system resources (CPU/GPU cycles, memory, etc.), and finally, the lost benefit from other features Y that were forgone in order to implement X (this last cost is often overlooked).
While we would all love to have been able to include local co-op to Saints Row, it was determined to be not cost effective, and thus, not included. (It was actually considered at the start of SR2, but was cut pretty early on for reasons that are listed below)
*snip*
[EDIT] Fixed some typos