I really, really, really would rather see a focus on "harness until booster-ready" than "harness as long as you possibly can". :twocents:
YES. Please.
My main points would be:
-Rear-facing is safest, but many children outgrow rear-facing convertibles by weight or height before they are physically developmentally ready for a booster.
-Children under 4-6 years old are not at the same bone development stage as older children, and their bodies are just not built to take the full force of a seatbelt. A 5-point harness distributes the forces across a greater area to diminish that force.
-Children need to fit properly in a booster before using one-- discuss proper fit.
-Children need to be able to remain in position 100% OF THE TIME before moving to a booster.
-Many standard seats have low top slots and a 40 lb. weight limit. A seat is often outgrown by height before weight-- when shoulders go over the top slots, the seat is outgrown.
-There are harnessed seats available that go to 65-80 lbs. for children who have outgrown their forward-facing car seat by height or weight, but are not ready for a booster yet.
-5 point harnesses can also be an appropriate choice for children who may be booster ready, but are seated in a position with a lap-only belt, since you cannot use a booster with a lap-only belt and lap-only belts should be used for a non-harnessed passenger as a last resort.
After you're done with this one you can do one on why kids may need a booster past legal minimums or even past 4'9".