Good aerobatic models do turn -with rudder - -it is a flat skidding turn tho - Any good one will do large skidding circles -with little input other than , typically some elevator -
Finishing a rolling circle - there is typically some rudder skidding added to get the circle to finish on target -
The judges may not see it - but it's in there .
Practice your rudder turns - get used to flying with all inputs -mixed in all the ways you can think of - -try extremely hard rudder turns -then find out how much aileron and elevator input is needed to hold it.
All good practice techniques.