+1 on the change from /home, but I don't think /usr/share is the right place. /usr should be able to be mounted read-only except when software is changed. That's something you can't do if you keep websites there. /var/www or /srv/www are much better choices.
You got me wrong. :-) /usr/share is used only for the datadir. According to configure this is for "read-only architecture-independent data". And those things should stay in /usr/share. There is no pre-configured documentroot where you have to put your webpages. That's up to the user who has to adjust httpd.conf to his needs. Nobody should put his web content under /usr/share. :-) But there will be an install message about this.
/usr/share will host the error directory. I for one have several hosts with custom error files, although I suppose a rw remount to change those isn't the end of the world. Dale