Ubuntu – Is it possible to print multiple (and different) photos from Shotwell

F-Spot can make some of the things you are asking for (though not all)

On the other hand, and though this is not an answer to your question, but eventually, and hopefully, it will be. There's a project called DarkTable, which is being developed as a substitute of Lightroom. The print interface, however, is still in the list of future features, but it's promising. More info: http://darktable.sourceforge.net/features.shtml

Edit:

What about gthumb?:

1. Up to 600 dpi
2. No standard sizes, but customizable ones
3. Paper tray selection in the print dialog (cups, I think)
4. Can do grids, but you can't mix grid sizes (you can mix photo sizes, but within the cell grid -meaning they will be adjusted to the cell size, but you can't select each image's size-)...
5. Guess you can print several times with same settings (you can't save settings, tho)
6. Can't test the borderless, as my printer is not capable of doing such a print :(. GThumb's dialog does allow you to set margins to 0, but I can't test it...

Try Geeqie, too...

1. Unlimited dpi
2. Same as before, you can customize paper size
3. You can't select paper tray (a workaround is print in Postcript, open the .ps file and print with the printer settings dialog customized to your likings)
4. You can print images in a grid, too (all cells same size, as before)
5. You can keep the settings for several prints
6. Again, can't test the borderless printing, but it allows you to set margin to 0... so maybe?

Have you tried Digikam?

The simplest way to achieve this is with tags, not events. The short answer is to manually import folder-by-folder, and tag each batch of imports.

The first decision you have to make is whether to preserve your directory structure, and keep pictures in folders like you have them now. Shotwell defaults to a date directory structure, you have an event structure.

If you don't care, have all the photos outside /Pictures, and import one folder at a time using File/Import from folder... . Tag each batch as you go. All your photos will be reorganized in /Pictures based on dates.

If you want to keep the event structure, make sure to un-check the 'Watch library directory for new files' in Edit/Preferences/Library. Move all the folders with photos into /Pictures. Then import one at at a time, again tagging each batch of imports as you go. You will have to keep maintaining the library from then on, manually importing photos.