The last parameter wins. In the above example the object with id=2 is selected.
It's on my agenda for a long time. So, I guess it's about time to do it.
If you need to migrate all data from one seeddms installation to another then just copy the data folder and dump/import the database.
Do you really need this tools? Which database are you using? Are you planing to change it?
6.0.39 already includes the changes.
I once started an extension called 'internal link' which is similar to a symlink in a file system. It was never finished because of lots of small problems, like access rights, notifications, etc.
I already did some changes which may partly solve the problem. The problem is basically that seeddms tried to create the preview while generating the list of documents within a folder. If a single preview generation fails, the whole list isn't shown. I removed that part and delegate the preview generation to op/op.Preview.php. Now, if a preview cannot be created, the list of documents will still be created, but that single preview image will be missing.
The extensions are located in www/ext. The extension manager can be opened in SeedDMS in the admin are.