No problem coupling the controls, you can always decouple with the flick of a switch.
I’m sure you are aware the Jungmeister is a highly aerobatic design. Don’t expect it to be similar to a lazy Tiger Moth. However with gentle control inputs it can be very friendly.
Have you tried exponential throws?
I believe I had about 40% expo on the ailerons and elevator, gave it a gentle response around neutral for general flying without sacrificing the aerobatic capabilities but still it flew like an aerobatic thoroughbred and not like a gentle trainer.
The tall landing gear and high CG always had to be respected too.
Yes. I have Expo dialed in at 40% and that has helped a little.