My idea is that when you do the specail beam cannon for piccolo you could press and hold the right-click button on the mouse and you charge the specail beam cannon into a beam. In the saiyan saga when he is training gohan for the saiyans he has to blow up the moon because gohan transformed into a ape. he charges a special beam cannono in his hand first then made a fist then it became a beam when he shot it.