Yes but post can be used 'chrooted' or 'non-chrooted'. So be sure to put it in the correct tmp... http://www.redhat.com/docs/manuals/enterprise/RHEL-5-manual/Installation_Gui...
OK, will be trying that today.
What I'm doing is coming up with a single install kickstart for all of our different types of box. It will ask you a few questions up front, and depending on what you answer, it will then do various configs in the post-install. e.g. either a web server, DB box, or a number of other choices.
The reason I want to do it this way versus have a different kickstart for each type of box is that first of all it simplifies the install. but also because when you have different kickstart files you often have huge chunks of them that are the same between files, and if you change something in that chunk you have to go around to all the files to make the changes. I know there are other ways around that particular problem - but I like this way.