1 - When saving a design, almost everything gets saved, including not so obvious things as point of view. One thing that isn't being saved is whether or not the checkbox Add ceiling lights is checked in the Create photo pop-up window.

Yes, it's saved. Please double check. [:(]

2 - When importing furniture or textures, the window called Choose model pops up. There's a search field where you can use *.zip or so to find your model. When importing your second model, this search box automatically gets focus, so you can immediately start typing. Unfortunately for the first model, this search box doesn't have focus, so you (or at least I) tend to start typing in a void. It would be nice if the search box had focus from the start.

I miserably don't have control on the file dialog. This feels like an improvement that should be posted to Oracle Java team.

3 - When opening or saving something, SH3D remembers the last directory. In itself this is good, but there is room for improvement. Maybe it's possible to
- a - add a section in Preferences where you can set default directories for different types of files, so that textures, models, and designs automatically go to, or come from, their own directories
- b - give the program separate "memories" for textures, models, and designs.

Not sure basic users will be so happy with that feature but why not... However, if I'm ok to store these directories in preferences internally, I won't add anything in the preferences dialog itself but these directories will be set from the last user's choice in the file dialogs.
Please fill a feature request so I won't forget.