Setting $TMPDIR allows for setting where the mounting directory will be created, but there is no option the name the mount directory itself.
An example of how this would work:
example.AppImage --appimage-mount $TMPDIR/.specific_dir
Giving no additional arguments to ‘–appimage-mount’ would simply default to how it currently works with random characters.
Implementing this would lead to more convenience to the user and allow scripts to mount to specified places instead of needing to use globs to find the AppImage’s files.