(In reply to MarjaE from comment #0)
Hey Marja, please do not exaggerate. Again, if 4 out of 150 plus shortcuts are not to your liking, that doesn't mean that the list is "full of" wrong items.
Stumbled across a lot of keyboard-mouse combos:
No, not a lot.
Open message or folder in a new tab in the background
Middle-click the message or folder, or Right-click the message or folder, then choose Open Message in New Tab or Open in New Tab from the context menu
There is no dedicated keyboard shortcut for this, so I added the mouse or mixed equivalent (mouse shortcut if you wish).
The contextual action can be navigated with keyboard, but we can't add the actual keys because they are localized.
Feel free to suggest a better wording; otherwise this is wontfix for me.
Open message or folder in a new tab in the foreground
Shift + Middle-click the message or folder, or
Right-click the message or folder, then hold Shift while choosing Open Message in New Tab or Open in New Tab from the context menu
It's kinda hard to do this by keyboard. Or by mouse. These are not shortcuts, and these require a working keyboard and a working mouse and the ability to use both at the same time.
Imo, mixed mouse+keyboard combos should definitely be listed here for the sake of completeness. I don't think we want to create another document for a handful of mixed-device shortcuts. Also, I don't see how this is harmful. And if you really wanted (on Windows at least), you could actually mimick mouse clicks with keyboard (on Windows, using inbuilt assistive technology).
List actual keyboard shortcuts on this page, or acknowledge the lack of shortcuts.
If you think that keyboard access is missing or insufficient, please file bugs.
I think the audience of the keyboard shortcuts document is not limited to keyboard-only users, and we don't promise that... ;-)