You can always do what my DM did when I played a rogue. SA is broken because you one shotted my boss. No more SA for you... Cursed. It might not be the best solution but it fixes your problem.
More realalisticly unless the rogue is swinging at the monsters legs because he cant reach any thing else I would give it to him.
More realalisticly unless the rogue is swinging at the monsters legs because he cant reach any thing else I would give it to him.