Hello, I had a quick look at the Linux AppImage, v0.9. Some remarks:
- I opened a photo folder, then Imaginario started to copy all the files in it to /home/user. I’m not sure this is a practical approach, my complete photo directory is over 500G for the moment and I don’t want them to be copied.
- I can’t navigate using the slider in the window with the imported photos, the slider is inactive.
- I switched to face-tagging mode, and tagged one face. It appeared on the left side under Uncategorized. I could drag it to the People section. But clicking on it did not show up the tagged face.
- Making the window bigger (by dragging a corner) garbled the window and my four processor cores were, and stayed, at max. I had to kill the app, then restart it.
My preliminary conclusion: still some work to do! 
But the idea of face-tagging this way isn’t bad at all.
Regards, Paul.