James,
Technically, everything you’re asking for is possible.
Concerns about file naming conventions are a bit of a distraction. The image gallery collects the name of the observer and the time of observation as compulsory metadata on all images. People don’t always fill in the object name (and sometimes they observe things that aren’t in the object database yet…), but I tend to fill it in retrospectively where it is left blank, to make the galleries more usefully searchable. With that information available in the database, you could easily imagine an automated process to assign the images whatever filename format is desired when section officers export them.
Adding other metadata is simply a plumbing job.
Best wishes,
Dominic