As soon as you move CG from Safety to Policing, everything changes.
Not saying that it would certainly follow the same here, but in both Oz and the US, the Coastguard have become a very harsh rules enforcement authority and not an organisation that is there for rescue, aid and education.
However, I do think that the NZ CG could be given a tooth or two at least and be able to enforce some laws. Although, the difficult part of that is the authorisation of CG people to be able to stop, board and enforce. It's not all that easy. People with such authority require special training. Not somet