My installer, well actually the Mint Linux 9 LXDE installer does not allow you to create an encrypted home folder (I think it is step 5 in the installer).
This is actually a default action/question asked in step 5 of the installer when creating an user for the system. (you can see it in Ubuntu 9.04-10.10 and Mint 9 and 10.)
I think the reason it is not in the installer is because of the lightweight desktop and not to slow things down by encrypting home folder contents.
I think the user Kendall can shed his light on this? (as he already posted something similar in the Linux Peppermint forum).
I am just saying it would be more then nice to choose/have this option in the installer as it is an really good/nice feature for improving security.
Think about all those system engineers who want to have an encrypted /home folder but also a lightweight desktop? (and dont want to worry about all the fuss for encrypting your home afterwards by hand taking some hours)