It would love to see the ability to somehow filter the questions an the active list. Its very cumbersome to 'thumb' through all the questions looking for one to answer. If filtering is not an option being able to have a favorites list and have them highlighted so they are easier to pick out.
UPDATE I updated and found the 'tags' button at the bottom which is nice. Would be better if there was some visual cue on the 'Active List' to see a 'favorite' tag.