I don't have the exact information in front of me, but from what I remember "engines 1 and 2" were running in the simulation in some way, but the user controls were mapped to 3 and 4.
From the Dash-8 forums I read:
FUEL OFF is a full FEATHER position of your CLs. Its -4096
The START/FEATHER is anything that is between -3850 and 0
If you switch on the "no reverse zone" option (0-16380), you basically get travel only between the min and max on the quadrant, losing the start/feather portion of the props. That's what it looked like to me anyway. By changing the .ini lower bound to -24000, that gives me an effective output of around -2800 to 16380 and allows me to set a detent around the min position at 0. If there's a more efficient/elegant way of doing this, I'm open to it.