The command+option+ left or right arrow (⌘+⌥+ ⇠ or ⇢) keys to switch tabs
and
the command+option+up or down arrow (⌘+⌥+ ⇡ or ⇣) keys to switch in-place windows don't make sense when using vertical tabs.
Switching this orientation so that the left/right shortcut switches in-place saved windows and the up/down shortcut switches taps will match what is visually represented in the UI make it simpler for people to improve their navigation of the Orion interface.
Thanks again for your consideration.