These are all topics and ideas that have come up previously when reach was being made, and, unfortunately, bungie did not apply any of these ideas to their forge. Hopefully 343 will take a little more notice of our cries for better forge and give us what we want. However, i would not be shocked if these ideas are not put into action. many of us (myself included) have limited or no knowledge on how difficult or time consuming all of these items would be. I would love to see these ideas blossom in Halo 4, but ask yourself this....
Are these forge ideas so crucial to you to make the game that you would be fine with the launch date being pushed back significantly so as to put these in the game?
If not, then dont be too disheartened if not all of these features are in the game. Like i said though, it would be awesome to see them in the new forge.