Not sure if i'm allowed to make a topic about this, but since nobody seems to know...
On Badspot's Block Party as of right now, are four types of sport-balls. Basketball (doesn't seem to have a texture yet), american football, dodgeball and european football.
You can throw all of them via left click, while right click is different for all balls. For basketball RC is passing, for e-football it's throwing it upwards to bounce it on your head and for a-fotball will do a reverse snap.
There also are ways of stealing them: basketballs can be rapid-clicked, a-footbals can be crouch jumped on, and for e-footballs you have to crouch under their legs.
Also jetting is replaced with sprinting, and you cannot sprint with a ball.
tl;dr madden nfl in blockland