Oh, I checked and you´re right. You can combine fast-weapon attacks with quick spells in the same round in the BG2 videogame, indeed.
I have to point out that you can also combine spells with casting time of one bonus action (Like shield of faith, holy word, etc) and an attack/cantrip/action in the same round too in 5e.
In BG you had spells with a casting time of one round and quick spells, and classes that could attack several times per round. That would be the same in both games because in 5e you also have those.
But bg3 uses the reaction system so you also have one action more in the enemy´s turn.
