Go to Jomsocial backend->Configurations->User Points->find and disable this config item "Like photo" and "Like album"
That configuration will respected on user points and activities stream as well..
The further like photo / album will not show then.. but the current stream cant be deleted automtically.. you need remove it manually
Yes you right, user still can like photos and albums, but the actions wont show to the stream, and that user wont get points as well.
Yes, the likes stream will still show on the activitystream, but not for photo and album like.. if that is fine I will close this topic :)