I have a question on an ability to add +stun to a weapon.

I have a question on an ability to add +stun to a weapon.

I have a question on an ability to add +stun to a weapon. A player of mine is using the Peerless Fighter playbook and took the Disabling enhancement which means his axes have +stun.  Now, in the past couple of fights he basically kept the monster stunlocked the entire fight (which is an issue of itself, but easily fixed by having more than one monster in the fight) however, he feels that his weapons should be dealing damage at the same time as opposed to just causing stun damage. I can see the point either way as it is written +stun which implies it’s an additional effect. Anyway, just curious if anyone else has ruled on this.