As it happens, Spark's idea is essentially
what MWLL did with X-Pulse Lasers.
"X-Pulse Lasers work in much the same way as standard Pulse Lasers with one major difference: they do not require a cool down time and thus can be fired indefinitely, making them effective brawling weapons since their high rate of fire gives them an impressive DPS. In addition, the X-Pulse Lasers have the same effective range as Standard Beam Lasers, giving them a slight edge in range as well. Because of the high rate of fire, X-Pulse Lasers can even be competent anti-Battle Armor weapons.
In general terms an X-Pulse Laser is more powerful than both a Pulse Laser or a Standard Beam Laser of similar type. The main problem with X-Pulse Lasers is that it is very easy to generate dangerous heat levels with sustained firing -- something that is especially tempting during intense fire fights. When heavily used it is best to keep an eye on the unit's heat, and to switch to controlled bursts when nearing red line."
BT-wise,
X-Pulse Lasers (described on page 321 of TacOps) were the IS's answer to the Clans' longer-ranged Standard Pulse Lasers and even further-reaching ER Pulse Lasers; they "cycle faster and with greater power" but "the results were weapons that gained reach while maintaining accuracy and damage, but suffered from a dramatic increase in waste heat."
Personally, I find the notion interesting... but I also think that MWO's implementation of (standard) Pulse Lasers are fine as they are currently - which, as it happens (and along with doubling the ranges of the IS versions to match that of the Clan versions), is also
how MWLL handled standard Pulse Lasers.
"Unlike X-Pulse Lasers a standard Pulse Laser cannot maintain its fire indefinitely and requires a short cool down time between firings."