Here in NZ? Yes, the coast guard run the most courses, more boaties using UHF and VHF to call around on the water than hobby flyers. A LOT of the course is less how to use the radio than it is keeping clear and concise communication and what to do when an emergency call comes through so not to inadvertently jam or speak over emergencies.. My instructor doing all the radio calls for the duration of the flying. I think there is a radio course or similar that needs to be completed before learning to operate the radio, I need to remember to ask about what is needed for that to happen.
We didn't use the trim at all when doing circuits in the Cub, Stick forces aren't all that high if you know what to expect. The trim 'Wheel" is also somewhat awkward to get to, being right down beside the front seat.Airspeed control is greatly aided by proper trim. Learning to trim for pitch/airspeed changes should become second nature and eases simple flying tasks like reaching for your map or supplement and other distractions. Make a change, trim for change. It should be as natural as any other aspect of flying.