Baldur's Gate 1 and 2 and the manuals and the wiki and all text in game and all the FAQs are vague about two-weapon style.
Now Star Wars Knights of The Old Republic 1 and 2 (albeit are 3rd edition) have stuff on two-weapon style:
1) You get two attacks at the same time.
2) The bonus from your strength applies more to the primary weapon than to the offhand weapon. The bonus also is even larger if you use a two-handed sabers instead of two sabers but BG1 and 2 don't have weapons with blades on both ends so the point is that the strength bonus in theory would be different for the one in the offhand or not apply.
3) There are special abilities that give you more attacks per round and fighting forms ("force forms") that give you more attacks per round. The BG equivalent I guess is haste and greater attacks per round from weapon master. Well in the KoToR games, the extra attacks always copied the damage from the primary weapon and the special effects like stun from it.
Now I'm not sure if the strength bonus is any different at all for 2E.
But I wonder especially if the bonus attacks per round always use the weapon in the primary hand and never the offhand.
And can it at least be confirmed that two weapons do give me extra attacks? I originally played the BG games before KoToR and I always saw two weapons as just "why? you lose the chance for a shield." But the KoToR FAQs are all about how dual-wielding is way better (and it is in those games.