Comment # 7 on bug 994322 from Steffen Winterfeldt

I would not do it via symlinks; that's likely to create a mess at some point
during package updates. Also, it's impractical if some tool needs to
determine the current state.

It might be a good opportunity to cut the line and move remaining config
vars out of grub_installdevice into /etc/sysconfig/bootloader.
grub_installdevice is not, as its name suggests, some file used by the
regular grub. So we can as well go the common SUSE-way of using
/etc/sysconfig.

In this case, say, bootloader::DESTINATION with values like 'disk', 'boot',
'root'.

We might put comment 4 into sp2 as it doesn't change the way things work
currently and only steps in if grub_installdevice is obviously invalid. But
for that I'd like some feedback also from Josef and particularly Olaf as to
whether this actually helps.