Yes, forge is awesome, but everyone that has ever wanted to create their very own maps, with terrain, textures and things like that, raise your hands (oooh, lot's of hands). It would make it funnier for the serious forgers as well for those who mess around, and we would see some people who can't forge normally in Halo 3 shine with some awesome natural maps instead.
I really hope this would come true, since it actually works on consoles (yes, believe it or not. Play the Far Cry 2 Map editor and get amazed). And they now could have the chance to input it on Reach.
Also I would like to say that interlocking and advanced forging should be made easier, so that you can concentrate on building an awesome map and not bothering on these tiny corners that makes everything unsmooth, and adding some new forge objects.
Please comment your ideas.
[Edited on 10.19.2009 7:33 AM PDT]