Ed Kolis said:
The "Weap Mount" button onthe ship design screen - it's a bit misleading since you can use it for things other than weapons, as modders quickly discovered 
Or rather, as modders incessently requested until Aaron relented and patched in such capabilities.
To fix the quadrant problem:
Open B5 MOD\Data\QuadrantTypes.txt
Replace this line (46):
Number of System Types := 17
with this:
Number of System Types := 15