Stargate RPG add dex mod to damage

Dex attacks do add their Dex mod to the damage.

On page 124 of the Beta Guide it has this:

DAMAGE ROLLS
Each weapon, equipment, or harmful enemy ability
specifies the damage it deals. You roll the damage
die or dice, add any modifiers, and apply the damage
to your target. Equipment weapons, special abilities,
and other factors can grant a bonus to damage. With
a penalty, it is possible to deal 0 damage, but never
negative damage.
When attacking with a weapon, you add your
ability modifier—the same modifier used for
the attack roll—to the damage. A particular
equipment tells you which dice to roll for damage
and whether to add any modifiers.
If an effect deals damage to more than one target
at the same time, roll the damage once for all of
them. For example, when a soldier fires a shotgun,
the equipment’s damage is rolled once for all
creatures caught in the blast.