I found another bug. For some reason grub-reboot ( the utility )  
checks if prev_saved_entry ( which has just been set equal to 
saved_entry ) is empty ( zero length or unset ), and if it is 
unsets it. This makes grub-reboot again equivalent to 
grub-set-default the first time you use it. Instead I changed it 
so that if prev_saved_entry is empty it gets set to "0" because 
default=0 is the same as default="" but the grub.cfg detects 
that you've used grub-reboot by checking if prev_saved_entry is 
not empty.

I've attached a fix for this and also updated my previous 
patches so they apply cleanly and are consistent with the new 
changes from the savedefault branch that were merged into 
experimental ( using set var=value instead of just var=value ).
-- 
Jordan Uggla ( Jordan_U on irc.freenode.net )