I just discovered that if you enable the server on a particular port and you then switch databases, that the server is still on.
I think that this might best fit as a user option per database with the choice of making the options globally effective. That is to say, there are situations where I want all databases on a system to be searchable across the lan. However, on my home machine I have a personal database that I would never want to expose. When I switch to and from it I should not have to remember to toggle the server on or off.
Cheers.