Stuart,
We run projects with network libraries, often using the cache library function. Although the ideal is that there is one single model file for a project, this is often not the case. Therefore there are occasions where you have several files for a project, and the potential is there to have different libraries as the project develops.
The frustration comes when you are switching between files and open up an old project file, that does not have all the currently used libraries loaded, and ArchiCAD automatically dumps the loaded libraries and reloads the libraries as previously used.
You then have to manually add the libraries in the Library Manager, and wait for them to be reloaded, when all you want to do is open up the file while keeping the currently loaded libraries.
I guess what I am after is the possibility of opening the Library Manager and having access to its functions before loading a model file.
May be its not an issue that you have come across, but it can be very annoying if you are working in a single session in ArchiCAD.