I have a couple of "nice-to-haves":
- the name tab for stacked elements
The planner I'm doing this project for would like the tabs showing above the element panel.
(I personally think it's a bit picky, but well...)
- a hover option for the element descriptions.
I was thinking of using the description to add information, suggestions to filter the data before clicking, etc.
Since space is such a premium, there's not much room to add text.