I like this idea very much. This weapon should be craftable, too. Energy weapons have one huge disadvantage compared to... well, every other gun class: with both small and big guns, you can pretty much gear up to any situation by crafting your own weapon, but the energy class lacks that diversity.
Sure, there are three types of energy damage, but one of them is of non-craftable weapons, and the other two are just too weak for serious battle (no offense, but changing the TP rifle weapon perk from penetrate to long range was... well, I wouldn't vote it for Idea of the Century). Except for gatling laser, which is, again, not craftable.