I'm working on this now. I think it should be /etc/default/grub.d/ rather than /etc/grub.d/, though, as /etc/grub.d/ already has quite specific and different semantics. Directories in /etc/default/ are unusual, but not unprecedented; there are already packages in the archive shipping files in /etc/default/kdm.d/ and /etc/default/lire.d/.
I'm working on this now. I think it should be /etc/default/ grub.d/ rather than /etc/grub.d/, though, as /etc/grub.d/ already has quite specific and different semantics. Directories in /etc/default/ are unusual, but not unprecedented; there are already packages in the archive shipping files in /etc/default/kdm.d/ and /etc/default/ lire.d/ .