Firstly, I want to say welcome to the forums
That is a long post there - I'm so glad you used paragraphs
I like what you are saying, especially about weapons, I found the section about the plasma repeater vs. Assault rifle very interesting. I never actually thought about it that way.
I don't, however, think that 343i are going to be adding any new TU to Reach. Not drastic ones such as this anyway. They are now pretty much working on Halo 4 full time, which I am happy about. I want it to be a great game.