When planning a big trip, I would like to be able to highlight using different colours, for example, blue for oldies, pink for D/T combos, yellow for high favourite points, red for qualified challenges, etc.
I'd be happy for them all to show up in the same filter {Highlighted: Yes} as the colour would quickly enable me to establish why I had highlighted them.
In geosphere I used to create different groups for different priority caches (as per the highlight examples above) and then combine them (or not) when I was in the field. Different colour highlights would enable me to create one group with all the caches within it and be able to pick out my priorities along the way, without missing any opportunistic non-priority finds along the way.
It would really help me with planning big trips with lots of competing caches!