Oolite Bulletins

Can the default screenshot directory for Oolite be specified to another file path besides the saves directory, even one outside the Oolite directory all together? Say, to a system's public picture archive? Where is the file path defined in Oolite's config files?

It is hardocded, I'm afraid. However, symlinks could help here, although I've never tried it myself. Have a look at this thread, there is some discussion about where snapshots get saved with symlinks too:
https://bb.oolite.space/viewtopic.php?f=8&t=15524

What I'd suggest doing in most operating systems is linking to the directory from e.g. the desktop, if you want to get at screenshots quickly.

E.g., in Windows right-click on the desktop (or wherever else you want to access it) and choose new shortcut, then browse to the directory. For example, on my machine the link is

C:\Oolite\oolite.app\oolite-saves\snapshots

Or simply set up whatever software you're using them with (e.g. a graphics program) to look into that directory.