Not sure why this was assigned to mountall; mountall only parses /etc/fstab at boot time, it certainly isn't going to be responsible for writing to it. Reassigning to nautilus, which I guess is what would have to provide an option to convert gvfs mounts into boot-time mounts by adding them to the /etc/fstab. (This is probably a bad idea, but I guess that's a decision for the desktop team.)
Not sure why this was assigned to mountall; mountall only parses /etc/fstab at boot time, it certainly isn't going to be responsible for writing to it. Reassigning to nautilus, which I guess is what would have to provide an option to convert gvfs mounts into boot-time mounts by adding them to the /etc/fstab. (This is probably a bad idea, but I guess that's a decision for the desktop team.)