hm 1 cannon is a good idea , but other can pickup (fountain usw.)
i have 2 ideas
1) pass to a teamplayer (hi is in a better pos.)
he can catch ore volleyed the ball
2) booste a other player (to get a better pos.)
ooh I love the idea of a ball you can volley, and a ball which say has the big boomer effect of knocking people, but does no damage so if used skillfully you could boost your own players where you wanted them.