Custom Game Modes

I have had... An idea (fancy that).

What if there were a map where you essentially created your own game mode every time you played? It would take place on a standard north vs south map, or east/west. I had some ideas for various factors...


Win Condition:
-Capture the Flag
-King of the Hill
-Hero Elimination (kill the enemy heroes)
-Town Hall/Hero Revive Building Elimination
-Sabotage (each team has a temple, tower, etc. that must be guarded)
-Resource Race

Units:
-Normal Base
-Regular Spawns
-Heroes Only

Computers:
-None
-DotA Style Spawns
-Defensive Heroes
-Normal Base (with large bonuses to prevent early extermination)

Special Modes:
-None
-Instant Kills
-Ultra Speed (very fast units)
-Mundane (no spells)
-Vampirism (health deteriorates, but attacks steal health)
-Champions (heroes start at level 10)
-Tactical (can call in air strikes/artillery barrages)
-No Towers
-Creepy (lots of creeps in between the two teams)
-Mythical (players are large, powerful demons with extreme powers, and AI is set to DotA style)


Maybe this has already been done, and I'm just way behind. But personally, I think this a fairly interesting idea.