It wouldn't hurt to make mages have auto slow now how could this be implemented you ask? Some sort of plugin same as healing spell getting an auto heal mod , but slow is more debuff than buff if you call healing a buff that is.
So auto slow would be auto cast on enemies that engage in "attack" behavior to make sure they don't just slow every enemy they see and waste their mana on lets say peons , so makiing them do this automatically would be a solid buff for humans , if auto cast healing and slow become a thing in wc2 they would make humans better in everyway possible!.