The exit assignments are normally controlled by this entry in the aircraft.cfg file, like this:
[exits]
number_of_exits=4
exit_rate.0=0.4 ;Percent/second
exit_rate.1=0.2 ;Percent/second
exit_rate.2=0.4 ;Percent/second
exit_rate.3=0.4 ;Percent/second
Unfortunately, it doesn't stop there. As you might have noticed, sometimes the exit (or pushback) key commands don't work as you expect them to. This is usually because some gauge or other in your panel is issuing 'invisible' repeating key-event commands in the background that interfere with the normal panel operation. The pushback issue is effectively solved with Rob Barendregt's excellent pushback gauge V4, and there is an exit control gauge which I haven't tried (exit_gauge_v1.1.zip, this and Rob's gauge on Avsim) that might suit your need.
