I did a bit of searching on the forums, but didn't see an idea that expressed this directly. I have a list parameter being used to drive a map and graphs on my dashboard. The calculated field tied to it creates a set of 5 map ranges and custom legend patches for each menu item.
In order for the legend patches to display correctly, each range's label has to be added as an entry in the default custom sort for the calculated field. These are sorted by hand and saved, as long as the data source doesn't change.
We recently had to change the data source and now have to redo this step, which would be a trivial issue if custom sorts could be exported and re-imported. Something to think about!