System rules?

Yes. If you want to override the rules already defined in /etc/defaults/devfs.rules, define your rulesets (Edit for clarity: in /etc/devfs.rules) with the same number(s) as the one(s) you want to override. See the devfs.rules(5) man page.
 
As a friendly reminder, do not edit any of the files in /etc/defaults/. Create a new file /etc/devfs.rules, you can modify any of the existing rule sets or add new ones there. If you want a combination of existing rules you can create a new set and use add include to include other rules.
 
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