For sure telemetering data can provide feedback that can help you improve your competitive pattern flying. GPS is probably number one. It can tell you if you are flying parallel to the runway and at the right distance out and if you are going out of the box. It can call out your heading every few seconds. Some of the new stabilizers can record your roll and pitch attitudes so you can see what the plane should look like when it is flying level and if you are really doing it. Just looking at your stick commands can tell you a lot about how well you are doing various maneuvers like point rolls where you want perfect rhythm. Equal time on each point. Straight and level entries and exits. Straight lines on verticals and 45 degree lines. I don't know how this can help programming your radio but the capability is available to allow telemetering outputs to command inputs to the controls.
Just knowing what the plane should look like when it is doing a maneuver properly is important to improving your flying skills.
As far as cheating, I wouldn't worry about the old guys who always complain and think we should go back to 1960s technology.
Jim
If you enter a pattern contest, the judges will often discuss with you the weak points in your flight. Then apply what they tell you. You could also watch the upper classes fly and see what good maneuvers look like. In my NSRCA district,,(6), we have clinics and judging seminars to help us see how to achieve a high score.