boot option I'd like to see

[Jim Rees <rees_(_at_)_umich_(_dot_)_edu>]

I have an i386 running 2.2 that won't boot off wd0.  The disk has too many
cylinders and the bios is too old to handle it.

Right now I boot from a floppy that has a /etc/boot.conf with this:

set howto -a

But what I'd really like to use is this:

set rootdev wd0a

This could be extended to bootdev and swapdev.  Is this even possible?  I
know very little about the convoluted IBM/Wintel boot sequence.

Yes, I know I can build a special kernel.  I don't want to.