Why have one crane when you can have two?
http://youtu.be/iZxNbAwY_rk?t=3m10s
I think a singular crane may be a bit flow breaking if you're adding it way above the main arena. If you add some stuff around it like steel frame work, other cranes and crane cargo then it may work better (having steel frame work would mean you can still have space for a superfall and maybe some stuff to dodge on the way down)