Let's say someone hacked the game and created a utility that lets people create their own events (simply by typing in what they want it to do, and a highly powerful computer AI does the rest), then post them onto a big server for other people to download and use in their levels, and would go so far as to allow players to create their own characters, ammo, game modes, and so on. It would even allow a person to create their own tilesets in seconds.

I know this is completely implausible, but would you appreciate such a thing?

Also, don't discuss whether or not this is possible. I know that for some of you this is easier said than done, but we already know this isn't very plausible.