authorized_keys is a ssh1-ism. You should be using ssh protocol 2, in which case you should just be able to add all the .pub files to the ~/.ssh2/authorization file. e.g., mine looks like this:
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cthom@mycomputer:~/.ssh2$ more authorization
Key id_dsa.pub
Key id_dsa_1024_b.pub
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but if you home dir is cross-mounted, I don't see why you need more than 1 key. ssh should supply the same public/private key-pair between any machine. right?
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