That's not right. The airbrake behaves exactly as before, it makes the a/c pitch up when extending it. When using the "autotrim function" (emergency guard closed for example) the airplane will stay aprox. at the same pitch attitude if you are at slow speed. It you are flying at high speed, above 300 kts, like the manual says, the trim speed is not able to compensate the airbrake pitch moment and the aircraft will pitch up a bit. If you are flying slow, the trim speed is able to compensate the airbrake effect and therefore there's almost no pitch change. And this demonstrates, once again as other kind of tests show, that our flight model is correct, also in this aspect of the flight.
It must be on your case as you say, because it works exactly the same as using a joystick button and as in the real aircraft.
The simulation reflects exactly the behavior of the real aircraft and what's described in the manual. Sorry, but you seem to be a bit confused with this. Read above :)
I know perfectly how to program the Cougar, I had one for many years since it arrived to the market and I still use it, I've made many advanced profiles for it, though it's a long time since I don't program it. BTW I have it with the FSSB R2 mod from Real Simulator :)
You are welcome. There seems to be some confusion with how the airbrake and trim interaction works. I tried to explain it several times but maybe I'll have to write again a more thorough explanation of the system.