Pretty sure this is understood however, when making a scale model there are sometimes compromises that the designer is not willing to make. At some point you deviate so far from scale that you are in the territory of "Sport-Scale" where you've gone so far to make that airplane fly in a way that is NOT scale. A perfect example is the FT Master Series Corsair. While it looks like a Corsair, no question, it has no tendency to fly like the real one. This is where reading up on the history of an aircraft is hugely in play. I suspect with a name like "Aircruiser" it was not intended to be aerobatic at all. It was meant to "cruise" and be a stable platform for transport.
Having flown this model again on Saturday (another great flight), The rudder authority is so good on this airplane. It leads me to believe this is the case. Roll control was more to keep the wings level and coordinating the turn with the rudder was the intended technique. This is a far cry from the beginner tactic of "bank and yank."
As with any design, the designer is at liberty to incorporate design to capture the look and flight characteristic of each subject. As-built, this airplane is controllable, but there is a lacking for control under extreme conditions. There is AMPLE power, and of note is that it is far more powerful than the full-size. These are checks and balances. They get ironed out with time and compromise.