There thousands of shortcuts I miss in 2.8 and adding them back in the input editor is unpractical since its hard to discover the idname of those tools (specially when those are menus),
Example of that are the Ctrl+Shift+C (add constraint) and the Ctrl+Shft+Alt+C (center pick) and Ctrl+Alt+U(user preferences)
And please STOP saying “You can just use the 2.79 keymap”, we all know that this keymap will get outdated and buggy really soon since no one will use it
Ideally we need a more reliable and easy keymap editor or an actually complete keymap with all important tools mapped to a shortcut.