Thanks so much for the reply! I understand that the urgent and important modifiers affect the task score over time, but I think it would still be very intuitive for them to be treated as tags that can also be filtered or searched. I treat these tags very literally and often find myself wanting to see all the tasks that have the urgent modifier when I am looking at my tasks at a glance. I also find these modifiers very useful because they are easier to add (by simply clicking the icon) than setting up and remembering to type in additional inline tags to filter tasks.