I'm sure I've heard EA say that they do listen to what the fans want - I wouldn't be surprised if they had some employees who actually go on forums like this to see what the players are saying about the game. I wish you luck but I'm a little skeptical about the mission - I don't know how anyone would go about getting in contact with the right person or people. Plus I think that Simstat has a point with the legal issue. I also think it would be hard for EA to take suggestions - I might want something in the game that the majority of people would hate or think is stupid and every member on this forum might have a different idea and won't agree on things... like I said, I'm skeptical but it would be great if you could get through and I really do wish you luck. As other have said, keep up posted on how your mission goes.

Ok, Day 1:
I mailed a letter to EA.
I know it dosen't sound like much but i just gave it a try anyways.
Keep checking back to this particualr post for more updates. =)