I'm talking about PvP, not leveling. We can't have pistols spies running with having both advantages of stealthing and dealing good amount of AoE damage. This is screwing up with PvP mechanics.
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So other changes would need to be made to go along with it.
IE - limit targets for aoe or make them single target in pvp to prevent the lamers. That would help defend against friendly fire also and would not embarass anyone or make anything imbalanced. The gun can easily be balanced and made useful to PVErs and the like and then be useless for pvpers due to the OPness you are concerned about.
If adding a new weapon requires all those changes to the game to make it balanced it's not worth adding the weapon.