I honestly dont understand the fascination with Tommy Guns. I mean, there is a REASON we don't use them regularly in modern times. Plus, outside of mafia lore, they really arn't that cool. In an open wasteland like fallout, all of that ammo is gonna spread out, and touch those nearby rocks, as opposed to the raider with his varmint rifle, shooting from twenty feet away. I'll take that varmint rifle thank you.
They added enough SMG's as it is, from what I can tell, we need more shotguns if anything.
Also, you KNOW a mod is gonna add it. Heck, I'm using a .223 pistol in FO3 with the Fallout Wanderer's Edition Mod. So its safe to assume that one will be added in game.
Or for the inevetible DLC. Stop making threads about this lol.