ToB has a PrC called the Bloodstorm Blade. It's 2nd level Class Feature, Thunderous Throw, let's you treat your ranged attacks as a melee attacks. This lets you use stuff like Power Attack, Iaijitsu Focus, THF bonuses and so on. It's 10th level capstone is the ability to attack
everyone once per round, which against a high number of enemies is insanely valuable.
You can also look into Ambush Feats with your Sneak Attack. Less damage yes, but the debuffage can be worth it. Maiming/Disemboweling Strike turns SA into Charisma/Constitution Damage and Head Shot Confuses opponents (50% chance they attack their own allies) for instance.
And as always,
Class Boosters and optimize that Sneak Attack value. Like 23d6+20 SA, rerolling 1s, is a good number to look forward to.