The reason why I made /etc/pam.d/thinkfinger is the way packages handeled in Arch. Every file is owned by a package which makes it impossible for me to include the changes in /etc/pam.d/other (which replaces commom-auth used in other distros). So there are two possibilites,
1. Too let the user change /etc/pam.d/other according to your README (which works well)
2. Add a /etc/pam.d/thinkfinger file and request the user to apply the changes outlined in the wiki page posted before...

I'm sorry for being lazy in this case but I'd appreciate some good reasons to spend another hour applying changes to a working package.

Thank you in advance,
Christoph

[1] http://aur.archlinux.org/packages/thinkfinger-svn/thinkfinger-svn/pam.patch