Did you try editing /etc/httpd/conf.d/mod_frontpage.conf and change:
LoadModule frontpage_module modules/mod_frontpage.so
to
LoadModule frontpage_module /usr/lib/httpd/modules/mod_frontpage.so
Maybe you also need to install the original frontpage-5.0-72psa.centos4.2.i586.rpm first for mod_frontpage.so to exist in that location... and then afterwards force an install of the new rpm you made following crash's how-to.
Haven't tested it with an active domain yet, but I can restart httpd without any errors...