It could be nice to have the ability to select a minimum severity trigger level On MAP for problem display.
Some times , you want to create a trigger on a host for SLA calculation , reporting, link attribute or other but it as no value to disturb the Map when it status changes.
All the Map and Submap are affected by something that you don't want especially to be displayed.
All maps would have their own severity level ,and eventually , the severity level of the map could be written on the bottom of the page if selected.
Otherwise " not classified " problem could be in this case , but the abaility to be able to configue it sounds greater.