1. It's a feature. Data saved automatically with no bothering "DO YOU WANT TO SAVE?" This will not be changed. But Ctrl+S is working. It saves your database too
Recycle bin for deleted nodes is in todo list...
2. Yeah, there are a lot of things to implement in tables. I don't have much time for this but I'll try.
3. Actually it's a bug and will be fixed.
4. Images from clipboard always
will paste as PNG even if you use Paste As... -> Bitmap. You can disable it manually in Notebook.ini (or registry) file by setting PasteBMPasPNG to 0. Clipboard always contains BMP format (not JPG/PNG/GIF/TIF)