FSX AI Traffic Take Off Clearance Issue

[Runway16]

Hi Guys,

 

I am having an issue with AI Traffic at one of the airports on FSX.

 

Aircraft won't line up to take off if there is an approaching/landing aircraft within "10" miles of the airport.

 

At all other airports in FSX I notice that aircraft will always line up to depart until a landing aircraft is within 6 miles of the airport.

 

Do you know why this one airport is different and is there a setting or .cfg file that I can adjust please to change it from 10 miles to 6 miles?

 

Thank you.

 

Steve