For point 3, as we see it the Engineer is requesting it for the pier head bearing shelf. This is different from the half joint in the beams in which a thinner section is being considered. For the beams I believe the diagonal bars have been provided. For the bearing shelf, these are not necessary as the design section is wider. If you want to provide these, I suggest you propose the same kind of diagonal bars as in the beam at location of the beams for the Engineer’s consideration as shown below. Note that these would make the installation very congested and your construction team’s efforts should be consulted.