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I think that sneak attack's only option shouldn't be extra damage, but should vary according to your rogue scheme. For example, assassins get the extra damage, thieves can immediately make a skill or ability check to steal an item or an amount of gold, and thugs can knock the target etc.

OR:

All rogues deal sneak attack as extra damage, but assassins take decide to take 3 on each die or roll when applying it, and other schemes gain extra effects to sneak attack as normal.