Automatically remove done tasks from specific tags.

I have some tags which are my "attention" tags, or those tags which are meant for me to take immediate notice of, such as 'for follow up' or 'urgent'. However, once I've completed a one of those 'for follow up' or 'urgent' which are marked @todo, it would be really nice if Sandy automatically removed the to-do from the 'urgent' or 'for follow up' tags, since whenever you complete an 'urgent' or 'for follow up' task, it always ceases to be urgent or for follow up.

This could be implemented with a checkbox or link on the specific tag's page, which allowed the user to check the box if he or she wanted Sandy to automatically remove done tasks from the tag.