using different root option in alternate kernel option in grub

[Micha Feigin <michf@post.tau.ac.il>]

I'm trying the setup my grub menu.lst to automatically setup two alternate
kernel options
1. using nfsroot so it needs to have root=/dev/nfs
2. boot localy so it needs to have root=/dev/sda1

so I tried to set
KOPT=ro
defoptions=root=/dev/nfs
altoptions=root=/dev/sda1

The regular option works great but the altoptions ignores the root=... and only
uses the rest of the line.

Is there any way to achieve what I want without tweaking the results after each
kernel upgrade?