I distinctly remember how in the original Baldur's Gate a party member with Boots of Speed, or hasted, or if he just started off right away, could outrun the fire wave from a fireball. Get out of the 30 foot radius and remain unsinged. In the EE game the fire damage is dealt instantly within "Trap size" of the projectile file. Those who are within 30 feet die, and the spreading fire is just eye candy. The fire spreads much faster than the leisurely wave of the old game, too. "Explosion size" in the PRO seems to be for decoration in fireball's case.
Is it possible to recreate the old spread mechanic? And control the speed of the fire wave?
Edited: with some poking around I understand this file a bit better... It's possible to send an "Explosion projectile" at those who are caught within the trap. It delivers the damage, and the projectile can be fast or slow. But it still always arrives, even if it has to follow the target around towers and through gates. An interesting possibility of a self-guiding projectile, by the way. We don't have any of that kind, projectiles like the magic missile are too fast for any tactical difference. Something slower but following enemies, something along the lines of Diablo's Blood Star... But for the fireball that's no good, still not something you can avoid. Doesn't a real spreading-circle AOE mechanic exist in the Enhanced Edition games at all?