As it's a military organisation there is, by definition often less flexibility.
During GW1, military rules enforced a very convoluted route through Benelux/German/French airspace. Maastricht controllers quickly sussed this out and were able, thanks to c-operation of all concerned, to organize shorter, "illegal" routings. direct from NEPTU to the south of France .
If we don't know we can't help. Our attitude, when possible, was always "direct the outer Marker and we'll sort it out"