I ment Piccolo's eye laser in that you left-click and hold to continue firing ki as long as you want.
Yea I guess you can also say scatter shot, but you would shoot the ki blasts faster, the ki blasts would move a lot faster, you can fire a lot more then 6-8 blasts, and its not as inaccurate as scatter shot because you cant click somewhere to have them all go to the same spot.
Have it like the first 10-15 blasts of Renzoku will hit the area you want (not exactly where the cross hairs are aimed at but within a small radius of it; kind of like when you do fast ki blasts at an upclose target) and as you keep shooting more blasts, the more inacuracte it will gets (the radius of where the blasts will hit increases). So just think of Renzoku as a rapid shot gun; The first hits are in a tight circle formation but as you keep firing, the formation gets more spread apart.