The "user" option in /etc/fstab makes it so the owner of the mount directory can mount and unmount it, but the GDriveFS code errors if I use it:

fuse: unknown option 'user'

If I hack the mount function in gdfuse.py to ignore that option, it works fine (since "user" is only used by the "mount" command). Technically this is more a bug with FUSE or mount, but I figured I'd report the workaround I found for it.