Are Weapon Finesse and two-handed wielding mutually exclusive?

I noticed some weapons, like the Elven Thinblade, can qualify for Weapon Finesse despite being classified as one-handed weapons. Does this mean I can wield it two-handed for 150% of my Dex bonus? Alternately, how can a Swashbuckler/Rogue multiclass apply Dex to attack rolls?