Yes, your spamassassin config can be changed (and user preference config).
Check also amavisd.conf for spamassassin section.
Now I don't know which version of spamassassin works in Zimbra 6. But if the difference spamassassin between versions 6 and 7 is too big of spam control settings may not work as before.
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# ZCS 7.1.3 SLES11 SP1
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