Just wondering, but what if someone could make some sort of plasmids mod like in Bioshock? I.E. The telekinesis plasmid would work something like an extremely weakened gravity gun mod, to where you can pick up blocks and hurl them at your enemies, and the Electro bolt plasmid would be like shooting a bolt of lightning like in SSP commands. The Incinerate! plasmid could be something like igniting your enemy like with a flint, but without placing the block of fire, and Enrage could be like the confusion command in SSP.
If not plasmids, even a super-powers mod would be cool, like unlimited jumping through the sky or a movement system similar to InFamous or Protoype, to where you could run extremely fast and jump extremely high, glide for a while, be able to climb and run up buildings and such.