I think you should better go to the targets ini. And there, change all the runway settings. So for example you have this:
[TargetArea032]
Name=Bole IAP
Position=526976,342925
Radius=6000
ActiveYear=0
Location=2
Alignment=FRIENDLY
AirfieldDataFile=desert_airfield4.ini
NumSquadrons=6
Target[001].Type=Runway4
Target[001].Offset=0.00,0.00
//Target[001].Heading=0
Target[001].Heading=90
Target[002].Type=Tower1
Target[002].Offset=-88.07,-860.34
Target[002].Heading=0
Target[003].Type=eor_shack
Target[003].Offset=-162.14,1590.40
Target[003].Heading=0
Target[004].Type=eor_shack
Target[004].Offset=161.96,-1589.53
Target[004].Heading=90
Target[005].Type=eor_shack
Target[005].Offset=-1349.29,-1597.02
Target[005].Heading=-120
Target[006].Type=eor_shack
Target[006].Offset=603.18,-436.44
Target[006].Heading=-120
..............
..............
Change it for the settings of a base that you know that it is Dirty like this one:
[TargetArea001]
Name=Asmara IAP
Position=512090,735150
Radius=6000
ActiveYear=0
Location=1
Alignment=ENEMY
AirfieldDataFile=desert_airfield6.ini
NumSquadrons=3
Target[001].Type=Runway6
Target[001].Offset=0.00,0.00
Target[001].Heading=0
Target[002].Type=Tower1
Target[002].Offset=530,-25
Target[002].Heading=0
Target[003].Type=windsock
Target[003].Offset=50.00,-1200.00
Target[003].Heading=180
Target[004].Type=windsock
Target[004].Offset=-50.00,-1200.00
Target[004].Heading=180
Target[005].Type=windsock
Target[005].Offset=50.00,1200.00
Target[005].Heading=180
Target[006].Type=windsock
Target[006].Offset=-50.00,1200.00
Target[006].Heading=180
.........
.........
Then be carefull to change the Alignment and all that kind of things.