I agree with @Packrat in particular that swashbuckling is as much in the feel of the game as the dice system. Granted, there are some dice systems that are very anti-swashbuckling, but as long as the game is permissive of swashbuckling poses, most systems will work. For instance, in a swashbuckling piracy game in FS3, the only tools you have to penalize or benefit actions are stances and attack/defense/wound mods. You could either let the PCs pose most whatever they want alongside the standard rolls (with stances factored in... swinging at someone from a chandelier certainly sounds Aggressive or even Reckless to me), or you could ask them what they're doing ahead of the rolls, and then provide bonuses for doing swashbucklery things. Personally, I think that the latter, while cool, sounds like a lot of slow-down for a system where one of the benefits is fast resolution, but it could certainly be done.
Anyhow, I think it's a lot more game culture than it is system. If you have a game culture where you're allowed to pose a good die roll as leaping over a table, tucking into a roll, and popping up just in time to skewer them with your rapier... you have a swashbuckling game. If, instead, you have a game culture where you have to check with the GM before your actions, and possibly get penalties or have to make additional rolls to no benefit based on wanting to do awesome things... you don't have a swashbuckling game.