If you want to increase the consequence of overusing this then make it consume stamina to add to its strength. It'll make the player immobile and leave them vulnerable. Might be useful IF your ally has been charging SB for some time and it needs a little bit extra to finish up.
If it could be re-directed so it's not just a toss and pray then that wouldn't be so bad either. Like if allies can block it, the block time lasts for 1 second, and then you can turn anywhere in a 180 radius in front of you to deflect it, it'd be a sweet tactic.
Heh you could even make a game mode based around this. One person plays as Frieza, Buu, or Cell, and their PL is ridiculously high. Everyone else has to "Deflect the SB" into the enemy to win. This would mean one or two people run around trying to throw him, and a bunch of others try to deflect the SB into him to win. Grab & Smash into the SB lmao. However, the good guys can only be killed by a SAM 3 attack. Using Turbo aura reduces the damage taken by SB to 1/2, so if you know you can't evade it, you can forfeit a kill to add one life onto yours. Obvsly this would need to be tested to see what works.
If all vs 1 is too much, then make it all vs 2, or all vs 3.
Sorry kinda got a little off topic huh?