The new Flexi-Toolkit is missing a "Replace" button -- the current workaround in the UI is: Deleting the level - Adding the new level - Moving the new level to the position of the old one.
This process can be shorten massively with a "Replace" button which replaces the old level with a selected new one at the same location.
Yes, if the level name stays the same you can overwrite the text file in the rank folder, but I still think the UI should be able to do this more easily -- not all users are familiar with file management -- especially in the case if the new level has a new name or the rank size is very big this button can shorten the process quite a bit.
