343 industries 
  
i say you make a new game called halo costume including everything you need to forge any map  
  
-a world generator so we don't need to use templates such as forge island/world 
  
-a  vehicle generator to costume build special vehicles if not a generator at least  a way to remove weapons from citron vehicles 
  
-a weapon modifier 
  
-a turret modifier replace the normal machine gun and pea shooter with any weapon you want 
  
-only multi player  
  
-the ability to move maps to any future games 
  
-the ability to create your own campaign levels 
  
-the ability to place your own enemies on a map e.g. enemy spawn point 
  
-a boos generator to build and create bosses  
  
-and last and most important  
  
the ability to retexture blocks to make different environments