When unzipping a single zip file (Alt+F9, internal unzip) TC shows 3 buttons in the progress dialog:
Pause, Cancel, Background.
You can navigate through the buttons using TAB and cursor keys left/right and up/down.
When unzipping multiple zip files though the Background button is missing (what's OK),
just Pause and Cancel are there.

Expected:
Same keyboard navigation abilities also when there is no Background button.