A very handy feature would be the ability to "Open with..." and auto-load the selected image into the graphical UI. The existing switches are very powerful, but don't appear to cover this (non-technical user) use case.

e.g. java -jar build/libs/AppleCommander-linux64-gtk-1.7.0.jar -f=/path/to/file
-or maybe (to distinguish from non-GUI argments):
java -jar build/libs/AppleCommander-linux64-gtk-1.7.0.jar -uiopen=/path/to/file

My preliminary attempts to add the switch failed (all the existing switches appear to focus on the command line tool), but I attribute that to not being a Java dev.