ToME: the Tales of Maj'Eyal

It looks like in Combat Training, Combat Accuracy points have an effect, but nothing is gained from points in Weapons Mastery or Dagger Mastery. Correct?

From the talent description for strength of purpose:
"You now also use your Magic in place of Strength when equipping weapons and ammo as well as when calculating weapon damage. These bonuses override rather than stack with weapon mastery, dagger mastery, and bow mastery."
So the answer to your question is yes, you don't gain anything from other mastery skills.

Thanks. It wasn't exactly clear to me due to daggers being Dex. Cool,

Daggers use both Str and Dex, so the Temporal Warden uses Mag and Dex for daggers.