Make impulse pistol craftable is a bad idea, however i think it would be great, if devs added it as a hard-to-find weapon (e.g. give it to some Enclave patrols or make it findable in spec encs)
Ruin, because you armors can't stand electric type damage 
ATM there is only melee electric damage type weapons and they are useless, because you cannot go near of opponent because you already died.
You can't say for everyone. My melee char (under certain conditions) survives 2-3 LSW bursts from melee range or 3-5 burts from afar. But when he gets close....
IT'S HAMMER TIME. (unfortunately he can fight in RT only)