That sounds complicated to code. I've never seen anything like it in any other game I have played. But what I do know, is that the whole dual wield blaster seems mostly unnecessary at best, and unbalanced at worst.
The bugs don't even get anything cool in return, I might add.
And it would make it quite a bit easier for dual blaster wielders to kill dretches. Two simultaneous blasts would kill a dretch, 3 would kill a regular granger, 5 would kill an Adv Granger.
Such a combination would also do 30 damage per second.
If you take reloading into account, this is more than the mass driver, and is only a few damage points short of the rifle.
So, just to repeat that, you are proposing something that does similar damage to the rifle, but with unlimited ammo and no reloads, with the main point being to equip builders.
And in the meantime, the regular granger still has no attack at all.
So, then, in conclusion...
How about not?