1. Should be in the doc's, but if they're not, I'll see if I can find them in the official documentation and maybe post them somewhere.
2. Just the way it is in the real thing.
3. During flight, the WoW (Weight on Wheels) switch, which is linked to the different areas on the throttle console, prevents the throttles from going below idle. This is a safety measure implemented by Saab. While on the ground, you can bring the levers back to GRD Idle due to the WoW switch being engaged.