interactive kickstart ?

[Gabriel L. Somlo]

Is there any way to keep environment variables across different
sections of a kickstart file ? E.g., if during %pre I solicit some
input:

%pre
echo "enter bootloader password now:" > /dev/tty
read -s GRUBPW < /dev/tty
echo "you entered: ${GRUBPW}" > /dev/tty
export GRUBPW
%end

... is there any way to make $GRUBPW visible later on, on the
'bootloader' line in the main section of the kickstart file?
I.e., can I make something like this work: 

bootloader --location=mbr --driveorder=sda --password=${GRUBPW}

Is there a better way to solicit the bootloader password interactively
(as I'd prefer not to publish it in a kickstart file, for reasons
similar to why I'm not including a 'rootpw' line) ?

Also, this is not the only application. I'd like to use environment
variables read during %pre in %post (in order to ask all the questions
early on, then proceed with an unattended install).

Thanks for any ideas, suggestions, or pointers.

--Gabriel