I am presently looking at using the information already available, including renamed labels. It would seem ForesterSOF is asking for a sortable comment field for more detailed notes than you get with a quick label. There could possibly be a "purpose" field, but I don't see how it would work. I had once tried naming rally points to sort them out by what type ship I was sending, but that doesn't work well when you are setting up tor escorted transports or fleets with augment ships, etc. I have not yet found any other information points I would create a sortable field for.
In the Rally Points Tab of the main lists:
Alphabetical by name. (to find all the meaningful labels I have made.)
Ships stationed at. (Where did I park my main fleet? Especially on a giant map.)
Ships on route. (Where is everybody going? Good for resuming a complex or delayed game.)
I am also looking at the Go To command and its list of rally points, planets, etc.
Alphabetical by name. (to find all the meaningful labels I have made.)
Distance from selected fleet. (which is displayed but not sorted)