Custom rules per user

So I have a case where various users can design their own rules to use on my server, so for example let us say Bob does not like the word “like”, he could design a rule and I would want to enable it just for him. Is there a way to have a category default to disabled, and only be used when it’s listed under enabledCategories in the json request?

I think you have to edit the grammar.xml and add default="off", then restart the server.