Hi Edgar

That’s correct if you trim it sort of functions normally but, to re-center the 2d mode and the 3d mode properly you have to turn off the system then turn it on again. In 2d mode you kind of get a drift in 3d mode it's behaves more normally
Trim wise. I got to test an inflight trim reset; they took it out however feeling that it for most modelers it could possibly just do more harm than good.

I really never had an issue with small amounts of trim in the air.

Hi Eddie, thank you hope im helping here. It's a pretty sophisticated unit for $75 bucks.

1. Yes, the unit will move the servos [in direct mode only] to whatever position the guardian needs to perform the maneuver it has received from your tx sticks. It will not take in to account the endpoints you have programed it will only see
a pulse width and move servos accordingly unless you put servo limits in of course. Direct mode basicly puts the Guardian in charge of throws.

2. When in direct mode the guardian is only seeing stick input %. (What I’m not sure is if it always measures stick % throw against the full range of pulse width or does the guardian dynamically adjust for each radio.)
I would think that it takes your radio output in pulse width as a percentage of a normal 100% stick movement, as you never have to calibrate your sticks to the unit. Ill email Eagle tree and see what they say.

3. Yes in direct rate only, it doesn't care what your end point is set at. All it sees is you command a 50% roll then attempts a roll every 2 seconds for a 1 Hz or 1 roll per second setting.
It's sort of a simple flight computer; you tell it where you want to point the plane it moves the appropriate surfaces to do that at the intended rate.
If you do not check direct rate then all the transmitter settings will pass through.

As to will it command a much higher rate, it depends on if you have set servo limits setup or not, if you have not it will throw to the ele ctronic or physical limit of the servo if the desired rate is not achieved.
Interestingly enough however I have also found that in this direct mode you can use dual rates to control response, so at lower stick deflections the Guardian does have a scaled response.