Non Existing Video Games You Would Love To Have

[Cobalt Blue]

I want to see a game where you can make your own 3rd person, or 1st person shooters.
Create your own guns,
Create your own characters,
Create your own levels...
Maybe even going as far as being able to change how npcs react to different things, and customizing their movements from a list of different pre-made animations.

I mean sure, we have fps creator and game maker, but those are programs that take years to master. And even then, making a 3d game would take forever.

Something that just simplifies this process. An M-rated Little Big Planet, if you will.

DOOM, or Quake 2.