You mean the ability to power up the fingerlaser?
This would either be far too overpowered, or remove the best feature of fingerlaser.
If it were chargeable and instant, it would become an all or nothing cannon. If it replaced the current left click to shoot with a charge meter, you'd lose the element of instant damage, and your opponent could react to a charging animation.
However, this does bring up an interesting prospect. Rather than right clicking to fire a volley of attacks, perhaps a meter that charges at the same speed as a generic beam could be brought up. This would be the charge for fingerlaser; it would have a much higher ki cost than a generic beam, but have the same damage/explosion radius as one, AND be instant once released. This could remove the potentially abusive throw/laser combo, AND give him an interesting/unique attack.