[chousuke]

It does that. You can hack the script to only install partial sets, but you're encouraged to install all the sets. I've seen at least one mention on the mailing list about merging the sets because the recommendation is to always install all of them anyway. They're just files on disk if you're not using them.

[tulluk]

Instead of hacking the script, you can run it with -n. You can then edit /auto_uograde.conf before reboot to instruct the installer to only install the desired sets.

As noted elsewhere, the developers recommend installing all sets. I personally prefer to avoid installing the X sets on servers.