On main desktop-application or web browser:
If you have a big amount of sub-items and you have to scroll down to make new ones in the bottom, you can’t see the column titles anymore as they disappear under the parent row, and it might be impossible to see what data goes in to which column. The column titles for sub-items should float at the top of the sub-items. This is not actually a new feature, but a GUI-bug that should be fixed without voting… I mentioned it for the developers half a year ago, but have not seen it yet.