I'm not sure that I understand what you mean:
> Or Open Office save-file menus that omit the option of saving to a local network
I'd say that it is "normal" that LibreOffice will omit that. Or maybe not, but more on this later.
One of the philisophies of Unix (and therefore also of Linux) is: "Everything is a file". So there are no drive letters, we have path to our drives. And if you have a small local network, then you're supposed to have the accessible filesystems of those other computers at your system (e.g. using nfs/cifs, possibly with help of automount4). So the drive of your wife's computer could be /media/rebecca/).
Once you understand this, it's clear that you don't need any extra option in the save menu of any program. You can access /media/rebecca/recipes/smellyoilyfish.odf from "cp", from LibreOffice, from whatever.
Now to the exceptions. Some programs (e.g. Emacs with it's Trump mode) can access remove files not only via mounted filesystems, but also via ftp, sftp, ssh etc. The same is true for KDE programs. They than use special paths for the filenames.
Did you miss the latter from LibreOffice's menus?