Strafe jumping and rocket jumping through the use of fireballs should be implemented. Also there should be a version of lighting that operates as plasma so I can run across walls and the like with it.
And put spears/throwing stars/xbows back in.
Not 100% sure what you want, but from the sounds of it...it sounds a little to futuristic syfy for me. Also, there are already threads stating that they want levatation back, so if you get that then there would be no need for fireball-rocket-boost.