Thanks for your reply, that's quite helpful, much faster than before as I only have to enter %i now. It would still be good if I good set %i as a default for every group though. As soon as I add another group or close/reopen APG, I have to manually enter %i for every new group.
Now, having said that, I did investigate a bit more while writing this reply. It turns out, if you manually change a registry setting, you can do just that. In this key:
HKEY_CURRENT_USER\Software\Kolor\Autopano Giga 3.0\pano
there is a value 'project_folderTpl' which you can just change to %i. Restart APG and it should default to %i every time now.
You certainly like to make things difficult for yourself.
You could have done it via Edit/Settings as shown in my screenshot - those are global settings, not the same thing as group settings.