P: It would be convenient to lock/unlock multiple layers at the same time

Would be great if you could select multiple layers and click a lock option that would be applied to all selected layers. With large numbers of layers it becomes a big time suck to have to continue to click the 'lock transparent pixels" button. Thanks!

Yup. It's likely you'll see that in a future release.

it is possible from the Layer menu but it would be great if we can multiple layers from lock icon under the blend mode option box.