wouldn't it be cool if you could drive a pelican?or if you could keep the duel weapons even if you switch guns.or if you guys didn't think about it how about having elites and spartans in the same group.or if you could hold duel energy swords.

Duel energy swords wouldnt make much of a difference

Yes it would be great, but is most of it balanced? I think not! N00bs come in here all the time (I am a n00b also, but at least I have common sense) saying, "Oh yeah it would be so cool if the MC was invincible that would make the game so much easier" and "Duel energy swords rock!"
Yes, there was an invincible MC post like that somewhere, forget now where.
As for duel energy swords, that would be the most powerful weapon of all, and much too powerful at that. Chop one, chop two DEAD. You obviously don't know about balance. So stop posting things like, "Duel Rocket Launchers!" and think about the concepts!
Plus there are a few hundred threads like this already out there, so stop with this multiple thread stuff.