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Also, multiple ranged attacks from lots of mooks already kind of operate like that, since they are all within range of the target, I presume that part of the troop or swarm's charm is that they get a larger attack bonus (so the jerk with a 37 AC doesn't just laugh it off).
Actually, as I understood the troop subtype from looking it over in RoW:B5, you needn't have an attack bonus at all. You've got a large number of enemies attacking a specified area with a plethora of arrows . . . the troop makes no attack at all, and instead you treat it more like an excellent ability: PCs roll a Reflex save for half damage, while those with evasion dodge all of it successfully.
Same goes for melee, except without the save. These are a large swarm of enemies flooding over and around you. There is no attack roll, only damage.
I used a troop of hobgoblin regulars against my PCs just last Tuesday, and they were a hit with my group. They loved it!