Currently the standard window supports everything needed to work with feature branches using git flow.

What about the other types of branches?

Personally, I am only missing "Start release" and "Finish release", but others might need hotfixes or support branches as well.

Having to switch to the log window to create a release feels wrong ;-)

Since most people will (hopefully) create releases far less frequently than features, I think it would suffice to put those commands into the "Branch" drop down menu - maybe even under a sub-menu "Git Flow".

It would be nice to have the ability to add a personal note, tag, flag, etc. to some repository or a whole group (e.g. mark repository with a "<red flag>", as with some E-Mail clients)

Could get 90% of the way there by supporting a hotkey for "Amend Last Commit", "Commit" and "Commit & Push". The others are a bonus.

I'm on Mac.

During  pulling the root repository, pull its submodules too, with their default pull settings.
Maybe, add checkbox "Pull all submodules with their default pull settings"

as described here https://stackoverflow.com/questions/6270193/how-can-i-have-multiple-working-directories-with-git/30185564#30185564 git can create separate directories off the same .git folder.

when trying to add one of those directories to smartgit,  you get the message:
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Add or Create Repository
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Should 'Revit' be initialized as a new Git repository?
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The specified directory does not appear to be a valid Git repository.
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[[&Initialize]] [Cancel]
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likely because it does not recognize the .git FILE.

When 2 commits are selected, we can compare files inside them by content.

But it's not clear which commit is on the left side of Changes window and which is on the right .

Now:

Want smth like:

Moving between windows by Ctrl+Shift+<digit> is not quite handy.

Please add 4 features: Move focus between windows (to up, down, left, right).
Maybe assign shortcuts Ctrl  + Arrows by default.

When I have multiple files with changes to commit, they are placed in red at the top of the window. Then I select some files to make some commits group by group. Every time, I make a commit, the scroll is moved down to the place on the list of unchanged files, since the committed files are still selected and these files are moved to unchanged files. This forces to me to move the scroll up again to continue with the next commit.

My proposal is to keep the scroll on the top of window, regardless the commit or if the selected file is moved due to status changed.

If virtual group selected, add or create does not put the physical repository under that selected virtual group