Root-on-raid install ?

[Tim Day <timday@bottlenose.demon.co.uk>]

I just tried to use a software raid device as '/', but soon after
selecting the partitioner's "Finish partitioning and write changes to
disk" a dialog says:

"Debian does not currently support using software raid for the root
filesystem or /boot partition.  A system installed in this way will not
boot".

Does that simply mean that the debian installer doesn't support setting
it up, or is it telling me something more fundamental (ie lots of other
debian stuff won't support it either) ?  Any plans for this to change ? 
Would I fare any better throwing LVM or EVMS into the mix too ?

(I'm using the 20040704 sarge netinst, BTW).  

Thanks for any info
Tim