It's actually a smart decision of Git's design and will most likely never be changed. You may find more information here:

https://stackoverflow.com/questions/115983/how-can-i-add-a-blank-directory-to-a-git-repository

Which exact functionality would you use here, supposing that the directory already exists?

Git does not support to manage empty folders.

I guess you are referring to Rename? I have updated the title correspondingly.

Implemented for upcoming 22.1 preview 1: all parents of the selected commit plus its entire first-parent history will be highlighted on HiDPI. For LoDPI we have not yet decided on the default, but at least there will be Low-Level Property "log.graph.highlightSelectionAtDpiScaling" to enable this manually.

To be more specific: you are requesting an additional "will be handled by LFS" indicator for untracked files in the Files view? Note that there is already a similar request for tracked files:

https://smartgit.userecho.com/en/communities/1/topics/966-

SmartGit 22.1 will show the merge base in the Commit view.

This option will be present in upcoming version 22.1 Preview.

We do not have any release date planned. But the first Preview might not be too far away. You may follow the Blog's RSS feed or @smartgithg on Twitter to get informed as soon as it is available. 

Version 22.1 will support diff.<type>.textconv.