You already can dictate what people in the school call you - that's been an option since Authority 3. You can do it in the same place as you set the uniforms :)
Pool Twins and Courtyard Girls will obey the uniform rules in the next update.
I am aware, but there are only 3 preset options, where Veronica lets you enter a custom title. We should be able to do the same for the rest of the students.
