I was just going to reply that Rule category is an ordered code and so just adjust in Data>Codes>General>Rule Category when i noticed that my ordering is NOT waht is offered when I get to the last page of the rule wizard!
I'd not investigated ordering but have had a run-in with HP which you should be aware of.
Because the rules are held in a poorly (IMHO) designed REP_JAVAOBJECTS table there is no constraint between the rule and its category. Hence you can accidentally delete a category which is being used! If you do this it then becomes impossible to re-assign ANY category to this rule, you need to delete the rule and start again, COPY doesn't help. I raised BUG, HP said "tough".